I don't think that at this point it is at all cost efficient to set out to mine on your own. Even when I looked into it a year ago, it seemed a stretch to make it work.
The advanced hardware that actual mining companies have puts any machine you can buy into extinction about as soon as it arrives in the mail.
Sorry to be the bearer of bad news, but I think you may just end up disappointed, and hoping to help you avoid that!
No its alright I want to hear all opinions before I do anything at all so Thank You