I haven't been to DL since I was a kid and after several trips to DW we have decided we have to come out to California to see where it all started....problem is we have no idea where to start!! I don't know how dining works out there, how long is a good length for a trip, what else to do besides Disney, where to stay, how to get around....basically I am clueless!! Please help!!!
Dining is not even close to dining at WDW. There aren't dining plans and most people find it's best to just pay out of pocket for meals.
Personally, I think the 3-day park hoppers are the minimum of time to allow in the parks. But it can vary depending on the time of year you go. Sometimes two days can be enough and other times you maybe need 4-5 days (especially if, like us, you like to go on your favorite rides a few times.)
There are TONS of things to do in Southern California. Other theme parks, San Diego Zoo, Hollywood, beaches, etc. The list is quite long so it depends on how much time you have and what types of things you're interested in.
There are only three on-site hotels that tend to be a bit pricey.
Disneyland doesn't have an on-site hotels that would be equal to a WDW value resort. However, there are a lot of off-site hotels within walking distance to the park. Some are actually even close to the gates then the Disneyland Hotel, I think. The prices of off-site places really vary.
As far as getting around, I can't really help you out there. We've always had a car (either from home or rented.)
If you're flying in, I recommend John Wayne Airport (Santa Ana, SNA.) It's a small airport and it's really close by.