Focus Global Community

This is my very first posting here on the forum. I´m planning on starting a forum and the final goal is to generate revenue through advertirsers on the forum (side banners, top and bottom banners, etc). For what I´ve been reading VB bulletin is the best forum software out there and probably also the best for my intentions but -for the time being- it is a bit out of my reach, budgetwise. So, my questions are: Is there any free forum software that lets me have advertirsers and can -eventually- have all of its content transpassed to a VB forum? and: How can I generate revenue from a forum? Thanks for the help in advance!

Go with Mybb there are 2 plugins you can get that allow ads

http://mods.mybb.com/view/index-ads

http://mods.mybb.com/view/my-advertisements