If you are in Ontario, try going for lessons over at Little Rock Western Riding Stable. They have group hacks and have individual lessons.
If you want to learn Barrel Racing, you might wanna find 3 barrels to start with. xD Place them in a Triangle form about 4 strides away at the top, and 8 strides down at the point.
You might wanna get a Barrel Racing Saddle too. And a STURDY well made bridle to go with it.
biggrin When starting out, walk the course as diagrammed below, then trot where it says gallop. Then, after a bit of practice, go at it at the trot and canter where is says gallop. If you are able to gallop, go out and give her a go when you get it down at the trot and canter the course and gallop the end. If you can't gallop, just ask for a faster canter.
biggrin You wanna go at it like this:

I learned to barrel race from MANY coaches and friends.
biggrin I wanted to do that kind of thing with Penny, but she is a bit old for it. D: