As a new player, 2 suggestions for you:
1. Learn from losing, and not to get "too" upset
2. Experience+Money+a good coach=win!
Choose the sphere wisely.
If you want to keep killing, gowen is good.
If you are good with calculating, you may choose falkow.
If you like stable and steady pressing your opponent, try refess.
If you have a lot of money and like surprising enemy, lawita will satisfy your desire.
I am not quite sure how many new players are joining this game,
but you can really learn and see the true face of this game in folrart.
The pre-built are pretty strong!
I personally recommoned Sea Behemoths, warriors, carbuncle and shrine knights.
They are pretty strong. If you need help with how to play these four, just let me know
and I would love to help you more.