to lose stomachis to losein general (you cannot target specific areas ofand you just need to be in a calorie deficit for that to happen. exercise can help with the deficit, but focus on the deficit for theloss

regarding arms, any kind of bicep & tricep work will help to start with, take a look at the machines as they should tell you what muscles they work, or google the machine name if they don't.
Btw just since people don't like to be more specific a calorie deficit for you would be only eating 2,000 calories a day and no more than that until you reach your goal in body physic. If you would like me to go more into detail on how to lose thelet me know but it basically come down to calorie deficit.