If your oven isn't a convection oven I suggest getting one, you will be glad you did. Also, a basic oven thermometer will work to check temps, 400* for 20 minutes is what I use for baking time.
Try the Lee Expander Die, a lot of us use them and it works. There are better methods but they are caliber specific. You can use a center punch to flair cases also in a pinch.
Welcome aboard and good luck, 9mm is one of the hardest calibers to cast and load so don't get discouraged.
Slim