haha idk backflip was the first trick i learned. so simple. id say learn a backflip and 360 first, then 5, then 7. be able to ride switch and then work on switch 3's and 5's. then try and cork stuff.
360's are the most important trick. If you know how to take off properly and do a good 360 and land forward you'll be able to do just about any trick well.