What kind of computer do I need to start a niche website?

[Jake]

Yea just to be clear almost nobody hosts their own web site , that computer wold be just for editing purposes. You could get by with any kind of PC, your internet connection speed might be as important as the computer speed, certainly you want data backup plans in mind, like external data drives to help preserve the site, though many hosts also provide backup on their end.

It may be a long journey to create a successful affiliate site, it's probably too challenging to create a forum just to snag prospects, I would concentrate on creating a publication (site) with superior content that earns search engine ranking and attracts lots of visitors, that actual selling part should appear as a secondary, afterthought pat of the site.

Warriorforum.com is a hangout for lots of affiliate marketers doing very similar things. You can find ready made niche review sites for Amazon affiliates for sale in their WSO section.