I own and run an AT Pro, Love it, yours runs slightly higher frequency @ 18Hz I believe.
Same principal as mine...
1. Make sure the wire is wrapped TIGHT around the leg of the MD, and make sure all connections are TIGHT, this is super important.
(You do not want slack in the cable if you can avoid it, it can cause jumpy readings -So I have found)
2. Make ground balancing a hobby in itself. being these machines are very sensitive, it makes all the difference. IF you change from grass to hard soil, GB. If you go from DRY sand to WET, GB... and so on.
3. Get a 5x8 search DD coil. It will make your life so much easier, also, get coil covers for longevity.
Lastly... Have fun! Don't take it too seriously. Enjoy the adventure and good luck on your finds!