You'll know when they've bonded with you when trhey don't crab a lot at you, don't mind you holding them.
About him running off, when I first got my glider's I made a "Clucking" noise and would give them a treat. Now they associate that noise to treat, and if they run off, I cluck, and they come. It's actuallt quite simple to train them that way.
If your worried about him running off, then always make sure the room his cage is in is secure, and the door is shut before you open his cage.
I've found you can really easily cheat the bonding proccess with treats!