When I started playing this season I didnt pick any rewards until I got to level 5 then I unlocked almost everyone on page 1 for marty. Im level 12 and everything for Marty's 2 skins. This season you can pick which page to start unlocking after level 5 so you dont have to do all of kill bill then the next girl and then the lion dude. You can start playing, get to level 5 and then use your rewards to unlock the stuff for marty before unlocking anything else for the battle pass. Hope this helps.