Stating the obvious, have you tried Bergman’s Grow Bible?!
As far as topping and pruning, most people say NO on autoflowers. I did read one article though, that said if you ARE going to top an auto, you need to do it at Week 2, or as soon as you can before Week 3. Because they’ve only got 2-3 weeks of veg after that.
Instead of topping an auto, you might try LST (low stress training), which is basically just “bending” the plant to keep it horizontal, and produces more bud spots. This is a WW auto I’m growing now at 2 weeks:
Here’s another WW in the same tent that’s 4 weeks old. It’s planted in the center of the pot, but the stalk grows near horizontal, down, then bent around to the right, and now I’m bending it toward the top. I’ll just keep circling it around the bucket until it starts to bloom. I’ve already got 8 unique bud spots started, in addition to the main stalk top: