If there are no magazines, or no skate-shops in your country you'll need to mail order from another country. The cheapest place will be in the USA, so get a copy of Thrasher which carries lots of mail order ads. Stuff you get for free. For locally produced stuff, best to ask a local skater. Wood decks are made out of plain maple laminates.
Slick boards have a layer of slippery plastic bonded to the bottom.
You can have just wood, but not just the slick part. Slick decks are usually heavier than wood ones. Current preference of most serious skaters is for wood these days. It also works out cheaper. Wheel sizes plunged below 40mm in the early nineties, but since then they've increased again.