To get wood, chop or cut down the trees with an axe. It will not look as though something is happening for first few swings, but try to keep at it. After adequate hacks targeted at the same location, the whole tree would explode and shower the wood down on you. Aim at a base, that way you will not leave irritating stumps behind, which means you will get all of a wood that tree has to offer, and also space you clear would be flat and very easy to build on. You can also visit http://terrariaforpc.com to download a detailed guide about how you can collect wood easily.
Once you’ve wood, you can then make a workbench. Pressing escape will give you an inventory menu. Below that, you will see a detailed list of items you can craft with materials that are available in your inventory. Selecting these items few times will straight deposit them into your own inventory. Once you have a workbench, drop those materials onto your taskbar. Once you are back in a world, select crafting table, with help of a mouse, or with one of 1-9 keys, and left click in order to plop it down on an even bit of ground.
You will find yourself constantly interrupted by Slimes. They usually hop around a surface in the hours of daylight, making a nuisance of themselves. They are as helpful as they are frustrating. Bludgeon them with your pickaxe (it has relatively faster swing and is additionally effective than a wooden sword in contradiction of annoying hopping enemies such as slimes). Captured slimes drop money and flammable gel. The gel can then combined with wood in order to create torches, priceless for exploring the cave. If you’re concerned about the mass deforestation that you have been doing, you can plant a different number of acorns gathered from trees.