Connecting the output of multiple micro generators

I'm about to put outlets in a pole shed (30x40). Is there anything wrong with putting 6 outlets on one 20a breaker? I'm the only guy working out there, so there won't really ever be more than a couple things drawing power at any given time.

We just survived a 3 day blackout here in Toronto. I got lucky and got my hands on a return that was waiting in front of the store I guess nobody saw it. It's a Champion 3000 Watt Generator Model Number: 46554 [url=http://www.championpowerequipment.com/generators/46554/]46554 - Champion Power Equipment[/url] Now that the calm is back I have a few questions. I would of rather get something more powerful but all the stores were sold out shelves usually with 10 to 15 generators all cleaned up. It says in the specs that it can power up a furnace. How is that possible I think that my furnace needs more then 3.5Kw and also what is the best way to wire a generator for a house? I have wires and a central vacuum that runs from the garage to the basement so I removed the insulation foam drilled a hole and ran 2 14 gauge cables that I terminated inside my basement I have 2 separate circuits but I doubt it's up to code since I used "extension" cables that I bought by the foot a few years ago.