Your welds will be crap in the beginning and it's normal. Don't get discouraged.

Pay very close attention to what is going on in your weld puddle (the part of the metal that's in fusion while welding it) as it will give you every detail you need to know if you're moving too fast/slow and if your settings are correct.

Always get comfortable! This is very important. Welding is nearly all about steadiness (to get a good looking weld) so make sure you're always comfy before laying a bead.

Wear coton clothes. You will catch fire and it's ok, you just don't want anything melting on your skin.

Avoid staring at someone welding without your helmet on. Getting a flash is not joke.

And finally, have some fun!! Especially if it's as a hobby. If left the welding world because of the industry but it is an amazing hobby of which I'm still in love with :)