Any tips on bringing my new horse home?

We are bringing our new 9 year old stock horse home this week. His new home will be a paddock with 5 other horses. Im a bit worried about him settling in. Has anyone got any tips or anything I should do or need to know.

I'd suggest keeping him quarantined for a week to make sure nothing crops up health-wise.
Then you can chuck him in with the other horses and keep a close eye on them for a couple hours - make sure to have enough halters for all the horses handy just in case.
Horses will tend to play a little at first, but they shouldn't gang up on one horse and beat the poop out of it.

Thanks for that. The only thing is the paddock he is going into is a shared paddock. Im hoping he will sort himself out and be happy.