hey, this is my first cell phone, i'm an older guy, and i don't see very well. i just now opened the box, and i'm very intimidated. so here goes with my stupid questions: 1. there is a sim tool. do i have to get a sim card, or is there one already in it? does republic even use a sim card? 2. there appears to be a screen protector already on it. but it has some sort of big arrow on one corner. am i suppose to take it off? again, i don't see very well, so i'm not sure what the heck is on it. 3. there isn't much in the way of instructions. does anyone know of a good tutorial maybe on youtube where i can learn about the interface? though this is my first cell phone, i have experience with cell phone devices, just using them as media players and ereaders. thanks in advance.