Hi Anne, welcome to OCF. You will find that this site has tons of info both here and on the main pages. Both areas have a search function.
Bulking up is the best thing to do. Drinking chocolate milk will help you put the weight on. A pint is 400 calories! When battling cancer, dont be surprised if your intake is over 3000 calories daily and you still have trouble keeping the weight on. Eat all your favorites now, your sense of taste will change. Eat it all then have seconds

Cheesecake, hamburgers, mexican, chinese food or even a big juicy steak, they all will taste different after a couple weeks of radiation.
Its a good idea to get your thyroid level checked now so that you know what is normal for you. Also get your hearing checked if you are going to be having chemo. Cisplatin can cause hearing problems.
Get to the dentist not just for the flouride trays but also a good checkup. Any teeth that arent in the best shape will need to be taken care of before you start radiation.
Any questions you have, please feel free to ask.