Getting into 10's 101, a guide to returning or new players:
1. Use 200 bucks for 10 tokens worth of gold and buy a 10's world tour (1 token worth of gold per dungeon).
1.5. Make sure the boosters are mostly using the same armor class as you do and get as much gear traded to as possible.
2. Wait for next reset. You'll be now rocking ilvl 420+ (with suboptimal stats most likely) and have a 1k+ score which enables you to sneak yourself into further 10's even if you don't know shit about them.
3. Pug yourself through 10's as much as you want and be happy