First one, Come here you can see many bounty you need: https://bitcointalk.org/index.php?board=238.0
To select a good bounty you need a few experience: check team, manager bounty, whitepaper, roadmap, amount participant...
If you do not know where to start, refer my signature. The bounty name Eloncity is the good project for you with high reward for social campaign. The manager bounty is good too, they manager many bounty, i never see they fail at any bounty. Hope with this bounty so.
Let's try bro.