Intros are fine.
Please do not make a full GPS for the whole map, because for a GPS nobody has time to watch it anyways.
In case one part between two cps is very difficult because of a trick that is hard to discover, it could be necessary to add a GPS for just the part between these two cps
Other MT effects are okay too, as long as they're needed for the track. e.g. a helicopter cam can be used for a certain passage.
Generally, you will probably only need loop and wallride cams, if even.
It really depends on the trick in that case. The track should still be finishable for players with a low to medium skill. If you're still unsure, just submit a map and a decision can be made for each individual case.
EDIT: outros are fine, but not necessary. It is even likely that they won't ever be watched...