First off, welcome to the forum!
Good idea starting with groundwork. Everything that you do on the ground to establish yourself as the herd leader with any horse will do nothing but help when you get in the saddle.
In general, just get him moving his feet on your terms. Put him on a lungeline so you have room. You can either use the tail of the line or some kind of whip/NH stick (your personal preference) to get him moving if you need to. Get him yielding his hindquarters in both directions first, crossing his hind legs each step - this is a basic move that will pay dividends if you ever need to shut him down. If he's crossing his hind legs, he can't bolt, buck, rear, anything. Next get him yielding his shoulders out of your space. Each end should swing like a well-oiled door.
Make sure he willingly backs out of your space. I'm not a fan of the NH "swing lead rope and send energy up it until they back" - I've seen too many horses smacked in the face with snaps, and that method's never gotten me anywhere with my own horses - it just seemed to unneccesarily stress and confuse them. Instead, I'll either tap the air, then the chest with the whip to get him back, or put direct backward pressure on the lead rope. Those ways have never failed me yet.
When he's mastered that, try lunging him, starting at the walk, and moving to the trot and canter as he progressively masters each lower gait. I don't know what your plans are with him, but you could either go with natural horsemanship-type lunging or more of a classical-type lunging (side reins, surcingle, etc.). Classical lunging is an art in itself, I won't go into it here as I'm not experienced enough with it to offer meaningful advice down that road. I think there are several threads on NH style lunging, which is basically an extension of the other groundwork.
As far as specific exercise ideas, I start from a lot of Clinton Anderson's groundwork exercises, with some variation here and there. Also, look into some Grooming and Showmanship class patterns - those are a good test to see how much "finesse" you have on the ground.
Recognize your personal space, define it for your horse, and defend it. That alone will go miles into establishing your respectability with him.
Best of luck!