It sounds so simple when I read it. I can do that. I just needed a starting point
I think good starting point is to take a bit of time and make a quick inventory of what you already have on hand. list out what's in your freezer, fridge, cabinets or pantry-use this to determine what you've currently got the ingredients for. so many times we'll say 'there's nothing to eat' and end up overbuying or duplicate buying on a grocery trip when in reality we've got plenty of items that we've just lost track of. if you're much more adept at using computers and phones than I you can create a spreadsheet to refer to when you go to the grocery store-then it's right there with you and you wont spend money on an item you spaced on already having on hand.
as others have said-meal plan. plan around what you already have, plan around the best sales items. look to the TOTAL cost of a meal, all elements b/c some meals that initially seem cheap can be far more expensive than comparable options. an example (in my mind) would be burgers. I have friends who view this as a really cheap summer meal while I don't. with burgers I have to have (in addition to the meat for the patties)-buns, catsup, mayo, mustard, pickles, onions, tomatoes and lettuce (produce is stupidly expensive where I live so it realy drives the price up), then everyone expects fries at minimum and usually some type of salad. THAT ADDS UP. on the flip side I can take the same amount of ground beef and make a batch of homemade sloppy joes, use only half the buns (we pour it on top and eat them open faced) which omits allot of ingredients (and everyone is satisfied with one side item).
Another starting point could be the following...
Monday - Italian night
Tuesday - Mexican night
Wednesday - Sandwich night (1st finish leftovers)
Thursday - Breakfast night
Friday - Pizza night
Saturday - Clean out the fridge/Leftovers night
Sunday - Splurge Night (since you like steak)
this is a great way to look at it-it helps you know in advance what you are making so you don't make panic purchasing choices (or have to rely on more expensive prepared stuff). we did this for years-here's a few more ideas on how we used it to stretch dollars:
Italian night-if I didn't have the time to make meatballs in large batches ahead of time I bought those big bags of premade ones at Costco or the grocery store and cooked extras in the sauce that I put aside for the next day. lunch the next day was meatball sandwiches with left over pasta (I made extra and also put it aside) but it could also be used for sandwich night (if I made pot roast or chicken parm it was used for sandwiches)
Mexican night-I use my crockpot to make shredded meat. I get whatever the cheapest cut of beef is (or if chicken is cheaper I use it) b/c it's going to get tender during the cooking process (and is often much cheaper than ground beef). left over meat (or the extra I always cook when I'm already going to be making it anyway) freezes well for future quick meals.
breakfast night-make waffles, make extras and put them in the freezer for breakfasts (much cheaper than eggos). take any dibs/dabs of leftover meats from previous meals (lone chicken breast or pork chop...) as well as veggies (bake an extra potato or two on a previous night) chop it up and make a breakfast scramble (less meat used but no one notices it in the form of a skillet meal of eggs, potatoes and meat).
pizza night-HONESTLY these days it's less expensive for me to buy than make. papa murphys has Tuesday night specials with any large at $10 (upgrade to a family size and it's $12). I make a side so everyone doesn't just power eat pizza (simple green salad or on sale fruit). if mr. murphy is not on sale then it's the walmart brand of premade crusts, a jar of premade sauce-and it's topped with whatever we have on hand (if I have a bell pepper it's that, always have onions on hand and canned olives, if there's left over seasoned ground beef it's added-we forage through the fridge to figure out the toppings and ds will remind me to cook extra bacon on breakfast night to keep on hand to crumble on top).
leftover night-we call it 'clean out the freezer night'. every leftover that couldn't make a full meal for the family/wasn't already repurposed is pulled out. it ends up being like going to a Chinese buffet. no one ends up with a full serving any anything BUT they end up with a full meal of the odds and ends.
splurge night-we didn't so much do this. splurges we did a couple times a month if the budget allowed. our 7th night was usually some type of meal that I could cook easily while I was running around doing whatever needed to be done (studying, cleaning, errands). something that takes little to no supervision in the oven (big turkey fan here-I get them on sale and put extras in the freezer) or in the crockpot. it was always something that was planned to generate leftovers for multiple lunches in particular (dh and I packed lunch so I would make up containers of stuff to freeze and pull out to defrost overnight in the fridge during the week). along the same lines-during the school year I make double and triple batches of hamburger helper (ds is addicted) but I half the amount of ground beef (he prefers it that way). it can be used for a couple of meals for a family AND before it's served the first night I make containers up to freeze for school lunches (god bless schools for putting microwaves in the cafeterias).
good luck op-don't get overwhelmed, just take it one step at a time and you will start to see the difference.