Need a push- ads and subscrition

[seaweed]

My goal is to generate funds for my forum by incorporating advertisments to nonregistered and registered users whom do not pay to subscribe to the forum. At first i would like to use Google ad or the equivlant (I have no idea what else is out there).I want to be able to set up a system to keep track of renewal etc. I have seen some that advertise in treads, like every 2 or 3 posts, as well in main menu. I have seen forums that i lke, but stupid me i didnt bookmark the sites and now i cant google them up. ARGG! I an new to Vbulletin but not cumputers. So im sure with a little push ill be able to figure it out. Currently i am averaging 160-200 users logged on at a time, i think thats ok for being up roughly a year.
TIA
seaweed