Hi, Bebelle,
Lots of great info and helpful people on this board! Keep browsing, you can find lots of answers. A couple of really helpful threads: Hydroguy's Tips compilation, a sticky thread at the top of the forum page:
http://www.disboards.com/showthread.php?t=1520483 There are lots of ideas there about when to go, where to stay, how to "do" the parks. Also a comparison of differences between WDL and DLR.
When are you planning on going?
There are 4 airports, SNA (12 miles) LGB (Long Beach, 14 miles) ONT (Ontario, 30 miles) and LAX, (which is what, 35-40 miles? Something like that). LAX is often cheap but huge, dirty, and more expensive to travel from. SNA is expensive to fly into. LGB is often as cheap as LAX and is preferred by many people on these boards, since transfer prices are about the same as for SNA. ONT is ok, price wise, too, but again, farther out.
Staying offsite is a good choice here. Many of the hotels across the street on Harbor are as close or closer than the Disney hotels. Great for taking a midday break to get away from the crowds and heat.
Lots of great ideas about those offsite hotels. Candy Cane Inn (which has their own shuttle to the parks) is a favorite, as is HoJo's, which has a fabulous Entertainment book rate of $59 (standard) and $74 (deluxe park-view) rooms for particular dates.
http://www.hojoanaheim.com/phpbb/viewtopic.php?f=13&t=14
Park Vue, Tropicana, Best Western Park Place Inn, and Desert Inn are straight across the crosswalk to the
Disneyland entrance plaza. Here's a map of the hotels with links:
http://www.geocities.com/ashpsyche/DisneylandLinkMap.html
If you stay in one of the 3 DL hotels, you get to use all the Magic Mornings (one hour early entry to DL) which are on Sunday, Tues. Thurs and Sat. If you stay offsite and purchase a 3 day or more parkhopper, you get 1 MM-- unless you order tickets through GetAwayToday travel online, which has an exclusive contract right to grant 2 MMs for you. There is a discount code you can use ("podcast") which will waive the $10. processing fee, so it's the same cost for tickets as ordered through the DL company.
3 full days is good for seeing the parks. I like 4 1/2 or 5 better, myself-- more leisurely. Then you could take an extra day or two and go to the beach, go to Universal Studios if you want, etc.
There's lots of info off the top of my head for ya!

Sorry to overwhelm! Please post with any questions you may have, there's so many friendly helpful people here!