you can't get free oak planks on runescape now stop being a noob and make them yourself. -.-
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The door should be automatically built unless you mean an oak door for your homes dungeon, you need level 74 construction and ten oak planks to build that.
Planks are outside of Varrok in the Lumberyard. You have to be a member to SMITH nails.
You can get planks from the grave yard in the wilderness. But if you are a member, get em from the saw mill.
That would depend on your current level. Besides, you may also want to know how much it costs with other methods (other types of planks, in this case). Therefore, I recommend you use an online runescape skill calculator, which lets you do this type of experimentation.
Yes you can use oak wood planks to create a bed in minecraft. What is important is that the wool and the wood planks are put on the exactly the same pattern. Make sure to have 3 wools on the first row followed by 3 oakwood planks on the second row.