Kicking butts with this:
When I'm actually trying to get points up in efc, I typically start with the 2 stars I'll be using. The choices for four and five star killers are pretty wide, but great two star cards are more the foundation. So yeah...get your foundation and build on that.
Having lots of damage and damage reduction cards puts you in a situation of control over your opponent. Attack manipulation clans are good for beginners.. also you can create decks with 5 cards from one clan and 3 from another.
Creating a good deck is a major thing in efc but also you need to learn how to start your match because there's a lot of different approaches. It takes experience so i'll just tell you to try different decks, don't give up on a deck too early thinking it's not good enough, maybe you only.need to adjust your strategy.