Could any expert user follow and help me step-by-step?

Good morning,

yesterday I finally started working on my Social Network and I built the empty website where everything will be constructed: https://nexsonet.wordpress.com/

But now, I’m in troubles. I’ve no idea how to proceed. I know that I need to install BuddyPress (and maybe WordPress 4.0 too?) but how?

I know that it’s incredible that I’m posting so many questions, but I’m a WP Beginner and I would appreciate some help.

So I was wondering if there is any expert user that could follow and help me step-by-step, at least for a short time.

I really need that help, because instructions sometimes are very unclear about some points and I can’t post a question in the forum every time I find something unclear: I would need to write so many posts!