I usually do one at a time, but once I get them rolling, and automate them, I just keep moving on to the next. Not even close to all the things I try workout, but when they do, I can usually automate it, and keep on cruisin.
I have learned, by being burnt many of times, NEVER to put all my eggs in one basket. NEVER EVER Only Rely On One Thing For Your BREAD AND BUTTER!
That being said, just focus on one method/offer/etc. at a time, get it profitable, and keep moving!