Personally, I would avoid releasing music under creative commons if your goal is to get paid. If you simply want it 'out there' then get a proper copyright and release it, or portions of, for free via whatever avenue makes most sense to hit your target audience. The problem with CC is... say you release a CC track with all permissions given under the intent that anyone who wishes to listen to it without restriction can do so freely... now suppose a company you're morally opposed to decides to use it in a national campaign...not only are you associated with something you wished you weren't, you're not getting paid for helping to promote them either. Even under the non-commercial release their are legal precedents in such cases were the offending party was held at fault but no monetary judgments were entered against them.

However, if you're ok with not making money and primarily looking to build an online awareness of your work, then it does have its merits... such as being free to issue.

Assuming your primary goal is to make money from the track itself and not the performance of your best bet is in non-exclusive use and master use.

Getting an account with ASCAP or BMI etc is defiantly a good first step. Register as a composer and publisher. Contact publishers, agents, community/college radio, regional tv studios that have a specialty in or need for your specific product...etc.

Not sure if that helps. Without knowing what kind of music you're doing its hard to give a specific response as regards marketing method, license release, finding an audience/purchaser, etc.