Rules questions regarding assault intersessors

[Beef]

Just a newbie question.  Having played 3 games now with my wolves over the last few months  ( i haven't played since 5th edition) i wanted to have skyclaws but as the SW codex does not have this i have made up a 10 man assault intercessor squad with jump packs.  my question is am i correct in assuming they do not benefit from SW rules as they are from the space marine codex.

 

Also next question i take it i dont need opponent permission to use them.

 

and finally is there a way to make them similar to blood claws rules wise by using strategms or CP points or something to give them something similar to blood claws advance and charge?

 

Also is there some handy little guide which lists things like rules for critical hits, sustained, and others.

 

Thanks