Hi there. I have just bred tiger barbs but I must admit it was by accident. I put a male and a female in a tank together to cycle it and hey presto - babies. Your female will be larger than your male due to the eggs in her belly. Try these sites cause I found them most usefull. One tip I will give you is that you have to watch them carefully. I took my eye of the ball and I only have two babies. The ate the rest of the eggs! I'll watch closer next time.
I've put a picture of one of my fry so you know what to look for. They are really small like shards of glass. It's in the bottom left of the picture.