My suggestion to anyone who is wanting to get into passover for the first time is to look at it from a reform point of view. One of the things I like about reform judiasm is that for the most part, they are more concerned about the MEANING behind why you do what you do rather than following the letter of the law. For example, I personally would consider egg matzah (technically not kosher for passover unless you are old or sick or pregnant) for example to be "more" kosher for passover than all of those new fangled processed foods that they make kosher for passover, like fake cheerios and froot loops or noodles, even those technically those processed foods are actually kosher for passover. IMO one of things that separates passover from the rest of the year is that you eat things that are different, like matzah. IMO, the "spirit" of the holiday is more fulfilled by egg matzah even if it hasn't been declared by a rabbi to be kosher for passover in actuality than cereal, something people eat all year long, even if it has been declared by a rabbi as being kosher for passover. Whew. Does that make sense?
Now I'm not trying to start a debate or tell anyone that what they are doing is wrong if they are more orthodox than I (not hard to be) BUT just trying to give some hints for people who are new to the whole thing. I think the holiday will be much more satisfying both spiritually and actually if you think more about the meaning of the ritual foods rather than worrying about your pet food. I'm glad that there is that option for someone to whom it is very important but if you're just starting out, the place I would start would not be with the pet food.
What we do at our house is we don't buy any chometz for a week or two before passover and try to use up what we have. It does get a little creative at the end. If I have some rice left (which I generally do since I buy it in bulk) I just leave it packed away.
For the first year I will be using a different set of dishes. I don't distinguish between milk and dairy but when my grandma moved in with my parents last year I took her "daytime" passover dishes (my sister took her china since I already have a set, and also the dishes she used for meat to use for her everyday dishes). This year I will be using them for passover. I figure they have been kosher for passover since the 30's and 40's, why stop now? They are depression glass and whenever I see them I think of passover at my grandma's, so they are super special to me.
The other thing we do is we try to not eat out during passover. I know I could have a salad or something and it would be perfectly OK but this sort of falls under the "the meaning is more important than the letter of the law." For meals we practically live on seder leftovers the whole week. Breakfast is either egg matzah with whipped cream cheese (another family favorite), matzah brei (an egg and matzah dish, can be sweet or savory) or my grandmother's "passover cereal" which is just matzah farfel with some sugar sprinkled on it and milk poured on. We never really ate sugared cereals as kids so this was a super big treat for us and I have great memories of it.
For lunches and dinners we basically have a lot of leftovers. My MIL makes something called a "health salad" which is basically a vinegar based cabbage salad, kind of like a light cole slaw. I always think of this as a springtime dish because it's so light. Eggs feature heavily both at the seder and the rest of the week... hardboiled eggs and egg salad go great with matzah. We finish off the turkey and the brisket and I like to make some extra of a sweet potato kugel recipe in muffins, it's so good. If anyone wants the recipe let me know and I will dig it up and post it. I don't miss bread at all when I can nuke a piece of brisket and have a kugel muffin and some salad! Matzah ball soup is also a good lunch.
My MIL also makes these garlic basil passover "biscuits" that he absolutely adores. They are SO fattening (have a ton of oil) but he is thin so he can overindulge. We only ever have these over passover so they fall into the "eating special things for this special time" rule that we have. I can dig up that recipe too if anyone is interested.