First you need to know the common mistakes you are making. You can get your report at www.believensucceed.com/freereport/oi.html
I would say the best way is to sell something you like and what people like. Another form is internet marketing. The top guru of all is this guy Jamie Lewis. Go to his link
(add a http: in front of the //)
There are so many out there but his is the best and cheapest.