My quick tip would be to survey the market for cheap level 2 summoners and gold cards for rent. Newbies can rent for 2-3 days, and the difference in 1 hp/1 damage can make or break games. Learning the two elements and the basic match ups vs your prefered element is also good. (Team comp with regards to mana cost, try it on the practice fights before you do rank).
RE: Splinterlands Card Giveaway - Two free cards!