I just bought a few domains and i’m looking to add just a little content on one of them and have the other websites re-direct to the main site…..How much is that going to cost me?

It depends what you mean by "content".

content as in the logo i already have, a contact us link and a little about the company…….a view of my amazon store if thats possible too…thats all im looking for

Nothing if you know how to load in your content and how to setup the domain redirects using the cpanel (or whatever your hosting company uses).