first: i would recommend just straight airing all the jumps and doing 90 on 90 off for rails the first few days
second: try to get the hang of spinning a little in the air, do some 180s on smaller jumps and maybe try a 270 off of a flat rail or box
third: step up a little, try a couple big 180s and maybe some smaller 360s, as well as some more advanced rails and tricks on smaller rails
fourth: get 360s down, and from there, you can go anywhere. i promise. start doing some pretzels and stuff on bigger rails
basically, just work your way up until you get to the first set of goals, but keep in mind that you will blow by those way faster than you expect. from there, you can progress in anyway you feel is good.