Social networking help what plugins?

Hey guys for the past week been nothing but a headache for me, here’s what iv been trying to do.

I’m planning on creating a social network on my site and been trying to add a plug in that will give me the features I need.
I need to add a login/register plugin that can be integrated with forums/ members chat and also the option for paid members to be able to post their own content on my home page.
I was checking out s2member but never figured out how to put the login/register buttons on the top of my website like most professional websites. I’ll be adding a woocomerce later to I’m a bit overwhelmed.
Right now I litteraly have no $ to spend on plugins at this time.
Anyone have any suggestions on free plugins that can integrate with all this and purhaps link the paid versions as well. This week has been a non stop headache for me.