Well then, maybe you should wait until you get the horse to figure out what it would need to work on, and work off of what it already does know. If it's 4 or 5, then it's probably been given the basics. Like it can canter, but only on the right lead, and has no idea when to canter. If you want to start from scratch, witch a completley untrained horse that hasn't even seen tack before, well, that's in a whole other post...
What do you normally do on a horse, jump, dressage?
I'd probably try long lining a horse once a week for about 20 minutes so they could learn collection and just generally be a pleasant ride.
And my advice for training any horse: let them make mistakes. Don't be afraid to do something because you fear their reaction. If you feel safe, ask, if they do it wrong, or have a bad reaction, tell them no, and then do it again.