You did great! Very nice trot work. That was a great first canter, a heck of a lot better than my first canter! Which I don't remember when the first time I cantered was, I think it was when I was a kid and may have been when a horse spooked and bolted with me.
That horse was more galloping than cantering. Canters are very controlled, nice, easy, and pleasant to sit. IMO, you CAN'T sit a gallop, if you do it's very rough. You really do have to two point. Until the horse gives a nice transition, it's best to two-point.
Two point is basically what you did, where you keep yourself up over the saddle, rather than sitting in it and riding the gait.
"You can do something wrong for thirty years and call yourself experienced, you can do something right for a week and experience more than someone who spent thirty years doing the wrong thing." ~WhattaTroublemaker