Paint is $85 at the shop, $90 at the field.
Semi and ramping are allowed (though ramp is overkill if you're playing walk on), no full auto. Groups can do as they please, walk on will be with rentals (including kids) unless there is enough for high tech/low tech separate groups.
Hopper/gun shots don't count. 10 ft surrender rule. All games are single elim except Castle which is respawn/capture the flag. Again, groups can dictate their own rules (though surrender generally holds for safety purposes).
Fields look like this: