How/what to eat right?

[cmdrost]

you'd be surprised how easily you could lose some weight by eating earlier. Like said above try eating by 6 and don't eat anything else, esp before bed.

Also, my biggest problem, is only eating 1 portion and not going back for seconds.

Do those 2 things and you can get away with some of the unhealthier options every now and then.

And then cut out completely:

carbonated drinks - diet coke, etc.
fast food

and you should be ok.