I don't have any good links to tutorials, but ill tell you this: if you're planning to scrog, its all about the pre-screen training. Don't just top the plants once PR twice and throw a screen over top of them right before flower.
I like to fim/top for about 4 tops, letneach top get about 4 inches long and then tie them down completely sideways. The little branches will start growing up towards the light, and it will REALLY help fill the screen out better.
Trust me, I've been doing a lot of experiments lately working on increasing my yield. The scrog method can be very effective if done correctly.
I have some 3 week old clones in veg that I'm training for a scrpg, let me grab a pic and ill show you what I'm talking about.