You get what you pay for in decoys, calls are another matter.
Cork is without a doubt the best material for a decoy the downside is they are heavy and costly.
Cabelas carries Heeter's cork at $250 a dozen whick is a very good price for cork. Depending on your location you probably can't go wrong building your spread with Mallards as a foundation. Here in the Northeast a combination of Mallards & Blackducks form the base for many a spread.
You're area it could be Mallards and Pintails. It never hurts to add Teal to your spread in the early season, again add the species that is local to your area. If cork is out of your price range go with Herters or G&H.
With calls there are a huge selection out there. Don't spend more than $30 max for any call. It's more important to learn when to call after practicing your basics. Leave the tournament B.S. for tournaments, it's notneeded for hunting situations. If you're a little nervous about calling at first , use a bellows type by Primos or Scotch. They take the chance of blowing a sour note and will give you that basic calls needed.