You'll need someone wih the relevant Codex for your other questions.
That said-
Killjoy00 wrote:Also, a couple of questions about reserve. When a model comes onto the table edge, does it have to make its full move right then? If a vehicle is longer than 6 inches does it have to move greater than 6 inches when it comes on (affecting what it can shoot)? Can models assault after coming onto the table edge?
Roll for Reserves, and once you know what's coming on bring them on one unit at a time, make their normal move measuring from just off the table edge.
A long vehicle would have to move quickly or turn to fit within 6". Pretty easy with the slack vehicle movement rules, but you might take shots in the sides or rear armour.
Models can act as normal once they are on the table - shooting, assaulting, etc. They can't use any 'start of the turn' abilities they may have (Tervigon's using Catalyst or spawning Termagaunts, for example) because they weren't on the table at that point*.
*some models are infused with magic fairy dust and
can use start of turn abilities (Logan Grimnar). If they can do this, they'll be mentioned in a
GW FAQ.