Welcome to the Solo universe. Almost all the answers to your questions can be found by searching this forum or using Google. Be sure to do extensive homework before posting a 'silly' question. There are several experts here that are happy to help, but etiquette requires you do your part first. Ardupilot.org copter section is a great place to wander around for general learning. A section is devoted to 3DR Solo: 3DR Solo - ArduCopter Master Upgrade — Copter documentation