do bagel two sevens off before you try pretzels. Pretzels cab be difficult because of how much you have to counter-rotate to snap out the pretzel.
My progression list would be:
50-50 ride on
50-50 front side on street styles
50-50 back side "
board slides using the shifty method
front or back boards (depending on which you find easier, front or backside 50-50's) on street type features
front or back boards to fakie
lip slides, front and backside
5-0 on boxes
front and backside 50-50, 180 out (both ways)
front or back boards, 270 bagel out
then start 180 easy way on switch 50-50, then 180 hardway to switch 50-50
That's a pretty good list to keep you busy for more than a season. Stuff like two sevens and 3's on are pretty tech and by then, you should be able to figure out what to do next. You can start doing combos like 180 to fakie 5-0, 180 out and things like that. I would suggest starting some of the stuff switch because obviously you want to be able to do a switch 50-50 before you 180 into one. You can figure that stuff out pretty quickly. Do boards before lipslides, then do tail and nose slides and blunt/noseblunt last because they're a combination of lipslide movements with nose/tail slide balance points. Then you can make them more tech with 270's out etc.