So I REALLY started Sammy under the saddle yesterday

This is how it went:
Mounted, he antsy'd around a bit, but was fine.
Turned him and walked him out, he wanted to eat, I said no, asked to go out into the pasture. Refused, reared.
I turned him in circles, both directions, asked again and finally started to get somewhere.
Argued with him for ten minuets, I wanted him in the far left of the pasture, not in the far right were the other horses are. Lots of backing up, dancing around, little bit of rearing but nothing unmanageable.
Refused to enter were I wanted him to. Alright, fine. Took him a few feet away from that particular spot and asked again with success.
For the next half an hour I made him do circles and figure eights around trees, walking up and down the fence line, random turns, stops, etc. Just plain worked him nice and slow at a walk.
He responded with lots of minor rearing, dancing around, backing up, and trying to rush back home. He was fantastic when he did mind himself and didn't try any funny business.
I kept a loose rein as much as possible with lots of emphasis on neck reining and leg cues. When he started to act up, refuse, rear, etc. I would have him do turns both right and left, then ask again.
I expect by the end of next month he'll be just fine and dandy again. After months of no riding, no work, just being spoiled, I don't expect a perfectly calm and respectful horse, even from a horse as calm and respectful as him xD
He does respond to leg cues and neck reining though, big plus. When I first rode him out he steered like a boat :p
I am VERY proud of him for walking calmly back home and responding well to what I asked of him. I expected him to try to take off, but nope, a nice calm walk, went right were I asked without so much as a pinned ear.
I'm riding him in a western saddle, with a hackamore. No pain issues, saddle isn't pinching and the hackamore is just fine. He DOES respond, he just gets pissed and doesn't want to :)
Does anyone have any suggestions regarding under saddle training? My plan is to work him at a walk until he responds nice and easy again, then start with trotting and work up to the canter. I'm treating him like greenie, taking it nice and slow. Not rushing or forcing him.
I'll be starting Loki this weekend or early next week as well

he hasn't been ridden in three YEARS. I expect him to act the same way as Sam.
The last time I rode him, he was EXACTLY like how Sam acted. He reared, he backed up, he refused, rushed, etc. the only problem is at the time I was to scared to handle it properly and he got away with it. I had never had an experience like that. It completely shattered my nerves. When I got on Sam last week and he reared I wanted to get off. I was kinda freaked.
But then my dad growled at me to stay on...so I did, and ended up getting off confident.
I know how to ride a horse. I took lessons for that, plenty of lessons. But they never taught me how to HANDLE a horse. What if they buck, rear, spook, bolt? Thankfully I've asked a lot of questions over the years and paid close attention to all the answers