Two at a time brotha, that is the key.
Focus your time and energy on two projects at a time to get the most out of them. If you start going from project to project, niche to niche, you'll find yourself unsatisfied and really not giving it all you have. The key is driving traffic to your landing pages and websites, this means having great SEO backlinks or setting up relationships with bloggers who are in the same niche you're targeting.
The truth is this. No traffic=No Leads=No Sales! You can have the sickest landing page ever but if you don't have traffic then so what?
Read this hub I just posted, great insight and tips/tricks to use.
Easy Newb Way to More Traffic: Without Competing In the Google Search Ranks
let me know if you need anymore info brotha!