Two quick tips to end the year:
"Smart businesspeople focus on the things they have the power to change, not whining about the things they don't." - Seth Godin
All you need is 2000. 2000 invoiced customers is enough to make a very comfortable living. Seth Godin says you only need 1000 loyal ones (and explains why here), but after observing this industry at 2000 customers, most are doing very well.