The simplest way to make first money is use existing ads systems. You need only to register and put code on your webiste

There two main ads system you can register:

TextLinksAds

You can earn about $5 per link.

You can register here: text-link-ads.com

BackLinks

Earnings in this system depends to page rank of your site.

Below are the current rates you will be paid per text link per month:

PageRank (PR) 1 homepage $.50 , subpage $.50
PageRank (PR) 2 homepage $1 , subpage $1
PageRank (PR) 3 homepage $2 , subpage $1.50
PageRank (PR) 4 homepage $3 , subpage $2
PageRank (PR) 5 homepage $4.50 , subpage $3.50
PageRank (PR) 6 homepage $12.50 , subpage $10
PageRank (PR) 7 homepage $30 , subpage $25
PageRank (PR) 8 homepage $75 , subpage $50

You can register here: backlinks.com