What are your hobbies? What do you do in your spare time? For your first online marketing venture make it something you are passionate about. Make it something you
know about...not something you just happened to read about.
Find a few good affiliate programs within your niche. Search around and find affiliate programs that pay out 40-50% on informational based products and 10-15% on tangible items.
It's
crucial you only promote a few affiliate programs per niche site. Anything more than that will confuse your prospect.
If you do not have an Adsense or Yahoo! Publisher account yet
DO NOT signup until you have some good quality content on your site. Lets say 10 pages or so with
NO affiliate programs on them yet.
Once Google and Yahoo! check your site and see the quality information they will
probably approve you. [Note - Do not be discouraged if Yahoo! does not approve your apllication the first time around. They are a little stingy with memberships so just let your site mature and reapply later.] Once this is all sqaured away you can go crazy.
Be sure to mix Adsense in with your product/service reccomendations so you'll at least gain something off of your visitor. If you have little experience in web development then sitesell.com and their Site Build It platform are an excellent and economical start. However your needs will soon outgrow its capabilities as your knowledge grows and the general market progresses.