Hi killaclown55,
To put paid links onto your site you are looking at something called an affiliate programme, or associate programme. (or spelled program as term originated in US)
The most common is from amazon.com where you put their link on your page and if someone clicks through to amazon from your page and subsequently purchases a book then you get a snippet of commission.
The centre of the universe for the best affiliate programmes in the UK is the a4u forum on
www.a4uforum.co.uk but to be honest it does not have too much on it for newer newbies without some searching.
That said, it is a fount of knowledge about the industry and reading that forum would give you some amazing tips once you know the basics.
In order to sign up for one of these things, typically you would register yourself with a "network" like affiliatefuture.co.uk or affilatewindow.co.uk or webgains.co.uk etc (listed on that forum).
You would then ask to be subscribed to one of the "merchants" that are listed there and who have banners and links to put onto your site. (some have a complete database of their products that you can take too).
They may choose to accept your application, this is usually instantaneous but some have stricter conditions, and depend on the quality and traffic of your site.
Once accepted, you take the code from the site (easy to follow instructions are available if you need them) and paste it onto your site.
That is basically all there is to it.
To get traffic to your site is a whole other game but that's not what you asked!
good luck
-aqls-