I'm glad to see Fanta got a few new players from this event. Most of us worried that the learning curve to start Fanta was too steep, and that 70k was out of reach for new players.
As for leveling units, you're looking at a trade-off between resources and time. At the early levels, feeding cheap cards from training though the Enhance / Level Break can get you started. The later levels are generally where you use goddesses, as they give a fixed number of levels no matter what (ie. 1 -> 4 or 101 -> 104, despite the actual experience needed being vastly different).
I'll make room in my ally list and send you an invite. My lead as an assist should help get you through the early levels.