I would like yo advise you that don't expect too much to get paid right on time. That is the first thing I learned in bounties.
If you want to find a good campaign, go to Marketplace(Altcoins) > Bounties. Check every thread which announces a bounty campaign. To find a good campaign, read always the white paper, check the team and the bounty manager. Scam? It cannot be guaranteed. Changes may happen.
This is a good advice, the first thing you should have to join this industry is mental readiness. You will not always get any profit, sometimes you will be a loss even you will not get paid. About the campaign, yeah you should understand it well (all aspects of the campaign). You will learn many things from your experience, it takes time.