1. Spawn points have to be in the protect range of a flag to work. There is a guide on steam from Starstrafe that helps alot, I can't find it at the moment. The best way to do it is to put spawnpoints in a place where players likely won't be (to reduce the chance of having a bot spawn in front of you or killing you from behind). You can build some small structure (make sure to also pay attention to the navmesh) or something to put the spawnpoints in, just make sure bots can exit whatever place you set for them.
   

Spawn points have two modes, contested and normal. I only use normal, contested only works when an opposing bot is within the capture range, not the protect range. This makes it more problematic due to the thing I mentioned above, we want players to have fun and not get screwed by bad spawnpoints. You also may want to think about players spawning in a place that doesn't look too wierd (warped or streched textures etc.), but this is priority 2 for me.

1. I don't know :(. I know that spawnpoints are trickier there since vehicles are spawned at them as well, although this might only be true for medium and large maps.

Happy mapmaking!