Looking for plugins

Hey everyone,
My name is Jonny and I am building a site using word press. At first I was using the CMS Concrete5 and loved it! But….their plugins or add-ons are very limited. So this is what I absolutely need for my site:
Forums (what’s a good forum plugin to add to my WP site) << This one should be easy to find.
Next, I need a point system plugin that allows me to add points to users and compare them to other users as well as put and post a leaderboard up. I would also like to let users basically redeem rewards with points but I don’t know if there is a plugin like that out there.
Also, I need to add a register/log-in feature which I’m pretty sure WP has that incorporated.
Finally, I need a plugin to be able to track user to user challenges. for instance, user A wants to challenge user B. User A goes into user B’s profile and selects a ‘challenge’ option. It then tracks the ‘challenge’ submission and sends a private message to user B as well as the Admin. User B ‘accepts challenge’ and the tracking has be logged in the website system. Once both users accept the challenge, a 30 day count down begins. In that 30 days both users need to complete the challenge but submitting a form that requires photo submission. Once both users complete the challenge, it is logged and the winner is determined thus rewarding points to the winner. Is there anything like that anywhere or am I SOL and have to find out how to write the code myself?

I am a complete newbie when it comes to web design but I am up for the challenge. My primary job as a military member really limits me to my time but when I have the time, id like to build my site on the side. I have been dreaming about this site for about 4 months now and have made a decent site on another CMS but it isn’t as good as I believe word-press would be able to make it. Please please please let me know if there is anything out there to make this idea a reality. Thank you.