Hello and welcome to the forums. The game has changed since closed beta, so everyone is kinda new to it right now. ;)
You may want to have a look on the news posted by Aych: http://www.gwentdb.com/news/109-how-to-improve-your-monsters-starter-deck. It is a good place to start with. Get yourself familiar with new cards and mechanics. Earn some cards through opening kegs and see how it goes. At early stages of the game, you will rely more on cards you earn than the ones you craft.