Not to rain on your parade at all, but I just feel like people ask this question about once per week without even considering how difficult or how much a PITA it will be... Aka, they aren't very serious, but pretend to be....
If you are truly planning on doing this, you best start your research and it best be more than asking HBT for their opinions. Further, it's probably going to be a few years before you can put your "business plan" (drafting one of those up should probably be your first goal) into action.
From the little I've researched and read, you'll need to acquire the appropriate licenses, be inspected by the FDA or other health organizations, etc. Further, you are definitely going to need to expand your brewery beyond 5-10g batches, if you want to do this seriously. Equipment = money, so get that business plan drafted and hope a bank will finance you (unless you are really loaded). You'll need boiling equipment, fermenters, and conditioning tanks (SS isn't cheap), you'll need a bottling line or kegging line if you plan to distribute, etc. You'll need a location... you probably can't run something like this in a garage (and make any money).
Then of course, you probably don't want to go through all this hassle to sell to your one friend's bar. You are going to want to sell to many bars and distribute... So, you better have a good marketing plan and some good beer - beers that have probably taken medals, etc. would be best, but aren't 100% necessary. Many professional brewers have attended schooling at USC-Davis, Seibel, etc. and REALLY know their stuff. Wayyyyy beyond what most of us understand from reading 6-10 homebrewing books...
It's definitely not going to be as easy as that cell-phone commercial makes it look where you just go out and start soliciting bars to take your beer... so if you are serious, it will be a while before you "sell" your first legal beer. If you have just recently started brewing (45 posts?), I would say you have a ways to go before you'll be able to make this into a successful "business". Also, keep in mind, turning a hobby into a business may not always be the best idea...
I wish you luck, God knows I wish I could just up and quit my job and open a brew-pub, but I just don't have the ability (read: my bank account is pretty good, but not THAT good!) to quit my job, nor do I think I am a good enough brewer after only 1.5 years brewing with extract and 6 months brewing all-grain, to really make a go of it. Maybe in 10 years or so...
If you asked simply out of curiosity, cool, but run a search and the question has been asked MANY times (with only a very select few honestly taking it on) but if you are serious, then I would get serious... There is some good knowledge on this board, but you'll definitely need to go outside the board also. And like I said, it you are serious, go at it full-bore starting now. It's going to take a little while to do this correctly.
