Hi there & welcome to the forum
Don't worry, we don't want or expect you to put your exact location, just your country &/or county is enough information, its just to help give out relevant advice for your general area, vet specialists & guinea providing companies mainly,etc.
if you are a minor well done for being cautious though, very sensible of you.

mine is North Dorset, England. & PiggieOwners is sheffield, South yorkshire, uk that is all thats needed.
unlimited hay & fresh water are essentials, a handful of veggies a day is a minimum & i give around 40-50g of nuggets a day for two guineas. Grass in the summer (gradually built up over a few weeks after the winter shortage)
Too much veg or grass etc at once can cause diarrhea or Bloat which may be fatal in some cases. remember to add green foods or new foods gradually this should prevent or drastically reduce these sort of problems
for more expert advice try the food link on the main forum page.
http://www.theguineapigforum.co.uk/forums/food.17/
PS i think one of the forum rules states posting lots of piggy pigtures if you can too


xx