Fighter

I've been doing weightlifting off and on for a while and i changed my diet trying to lose weight and it helped slightly but i can't get rid of my stubborn stomach fat that is hiding my abs and stuff. In addition to trying to lose that fat i also wanna get lean and muscular. I dont' wanna be huge and burly but leaner with low body fat.

My arms are especially weak though my legs are really strong. I'm trying running but where i live and such i don't have a nice running path so i only am able to do tread mill unless i find a running path or something.

I'm 17, 5'11" and weight around 215. For whatever the reason i can't do push ups or pull ups but i can do sit ups.

At the gym im working mostly on my arms, I use the machines that help with like pull ups, the ones where I push out where your like punching, and the other arm stuff. Sorry i dont' know the name of the machines or muscles. To get a trainer at my gym i have to pay a lot of money and since i am a fighter this forum seemed better anyway since it has a lot of people that know what they are doing.

I did Taekwondo for about 5 years and made it to 2nd Degree Black Belt but i be damned if i can't get rid of this belly fat. My Taekwondo class closed so i haven't been active in that for a while but i was still over weight when i was in that too.

Any advice on a workout that would help me out? And possibly a good diet too. I don't wanna post another thread in the nutrition section just for this when it could be done in one shot. Any help would be most appreciated.