I would say somewhere around $10, probably less though as the domain appears to not have long left before it needs renewing. It is a good domain though which will add value to it but regarding the forum I am not seeing any content worth purchasing. 😉
Well develop it really well, and get a unique set of loyal and active members then experiment with ways to make money.
If it makes like $100 a year then it'd be easy to sell for $100+ to a buyer with long term goals.
Or...don't begin so many new projects - focus on one at a time
I would start adding more content if I was you but concentrate on the FIFA areas first if you can. Also when advertising try and refer a few of your mates who play FIFA to your site and see what they think of it. 🙂