Hi All: Bounty Hunter BountiesFollow

Hi All: Just asking about Bounty Hunter bounties, how do they work and how do you collect the credits for them? So far I did around 12 bounties and haven't collected them. Do you have to go to Jubba right away to get your credits for the bounties you did? So far I haven't done the quest where I get to meet Jubba so do I lose all those credits? Please let me know and thanks for you help.