Well I would personally just get a good vegan cookbook. There are tons of good ones. All the way from rather "fruity" ones to ones that a meat and potato kind of person can appreciate. Just go shop your local borders and look through them for a few hours while you sip coffee. I can recommend some but I have no idea what sort of person you are so maybe my recommendations would be pointless to you. It's best if you just go explore them yourself.
With regard to making dinner just replace all milk with either soy, rice, almond, or hemp milk. Replace butter with either "butter" flavored shortening and earth balance margarine that is completely dairy free. Cheese well cheese is harder because alot of cheese alternatives are very different in texture and taste than dairy cheese... plus be careful alot of these cheese's, like soy and rice, have dairy components still in them which you wouldn't think but they do. I just buy Rice cheese that specifically says vegan on it. Just make sure your cheese says vegan and you should be good. Like I said it melts and such but tastes much different than real cheese. I got use to it but not everyone will. You just have to play around with vegan cheese. No one seems to agree on which are good and which aren't so good. So just experiment and see what works for you. If you have a local Whole Foods/Wild Oats Market, or health food store they will usually stock a huge variety. I have a great recipe for a parmessan cheese replacement that is nuts and nutritional yeast. I have a great replacement for melted cheese for dips that is easy as well. So those are easy to replace. Veganiese replaces Mayo. They have soy yogurt that is actually better than true yogurt. I have a recipe for sour cream that I make all the time. It's super easy otherwise you can buy the "I can't believe it's not sour cream" stuff. Most of this stuff can be found at any health food store or even just the health food section of your local grocery store. Here all of it can be bought at Hy-vee's and Baker's even in their health food sections.
Now with baked goods that should be much easier. If you get a vegan cookbook of those sorts, and there are some awesome ones, it will be all egg free as well. It might still be useful in learning how to make frostings though. Anyways I just do all my baking with earth balance margarine and butter flavored shortening. I replace all milk with soy milk. And you can mimic buttermilk with vinegar and soymilk perfectly. Baking is really the easy thing!
Anyways my whole family made the transition for me and my daughter and we've gotten quite use to it but it takes time. Good luck!