Ok, so you spawn in a world with a rock and your wondering What to do so first go find wood piles or Stones(little Boulder things) and hit them with it keep doing that for a while. TAB is your inventory so press that and then on the top there will be something that says Crafting, Click on that it will bring up ur crafting Rectangle thingy so if u want to make a wooden "Shelter" then u have to have "Wood" if you want an actual base u must click make "Wooden Planks" and make some, it is 10 Wood for 1 wooden plank so it isnt that hard. After you make ur little base or shack you should get some food, go kill a pig , deer, rabbit, or Chicken and you will get Raw Chicken (or something like that) then make a campfire and put the Chicken in it buy Holding "E" on your keyboard and pressing "open" put the uncooked food in the campfire and then back out of the campfire and tap "E" so it will turn the campfire on!

Hope this helped a little bit!!!

so After u get a little shelter going u should probably make a little Weapon such as a Hunting Bow or a Pipe Shotgun some people even like the hand cannon. you can find Better weapons in "Gun Crates" which are blue and Silverish. The best place for the Gun Crates are Small/Split/Mini Rad Town. Some Good Weapons are M4, Mp5a4, Bolt Action Rifle, And Shotgun. there are also some pistols such as the P250 and the 9mm.