Deepground and Type-0 3 Element Deck

Imo, mono or bi colored deck would be best to start out with to learn the game more. Tri-colored decks are much harder to pull off, especially without a Cosmos backup. If you plan to stick with three elements, try adding Cosmos to your deck.

All your forwards are low power. Even with the buffs, your strongest will be will Queen at 8k. You'll most likely need to do a lot of party attacking to get a damage through to your opponent, but that'll leave you open for an attack. You could probably added a few bigger forwards to keep open for blocking. Squall is a good blocker for big guys, but only once if he has to trade with your opponent's forward. If you have a big Forward on the field to block, then Squall is an excellent attacker as well if your opponent wants to keep their forward alive. Also, having a few bigger power forwards that can survive damage board wipes helps to keep you stable enough to bounce back up.

You should have a few more summons. When I first started deck building, I thought that I didn't need them either, but you really do if you want to have some tricks up your sleeve for an element of surprise. You can take away some backups. I try to go for less than 20 backups. Try adding Jihl Starter card to replace Harley since you're not running any Edwards in your deck. Since you have a lot of low power forwards, you'll need to add more summons/backups that dull and freeze. It'll put your opponent off an extra turn while you attack freely.

I hope that helps you out.