and now i want to bulid musle. ( still lose some pounds tho

now i got a muli gym and 180kg in free wights etc .
i have made own work out plan inc cardio , working out difrent parts of the body 5 days a week ( e.g arms,chest,legs etc)
( all so useing 100% pure whey for protein)
the only part im finding hard is what foods lol.
i see ppl say fish but what type of fish??
can some one give me some good ideas on what foods as im stuck ??
i have made changes allready.
brown wholemeal over whight bread.
bown rice , normal ots with water.
5 a day etc