You would be best off to buy them through the Grand Exchange. But if you insist on doing it the hard way...
Planks: You can get logs exchanged for planks at the sawmill (for a fee).
Steel Nails: You can make nails through Smithing. You will need a steel bar and a Smithing level of 34. One steel bar will yield 15 nails.
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You do not mine steel ore. Steel ore does not even exist! You may have thought that because of a steel bar. Well, to get a steel bar, you have to use one iron ore and two coal ores.
Wooden doors in Minecraft are easier to get than iron (steel) doors. Most people use the wooden doors for their first house, since the materials to craft a wooden door is much easier to obtain than iron(steel) doors. Wooden doors can be opened by right or left clicking, while iron(steel) doors cannot be opened neither left or right clicking. To open an iron(steel) door, it has to be powered by redstone. Which means to make a simple user-friendly iron(steel) door, place a button or a lever next to the iron(steel) door so it can be opened easily. Iron(steel) doors also has a better blast resistance than wooden doors (As you may have already guessed by the materials it uses). The similarities between them is that both can be powered by redstone. But the bad point about wooden doors is that if you create a redstone circuit which powers the door kept to be closed, you can change the circuit by just right or left clicking the wooden door. But since iron(steel) doors cannot be opened unless triggered by redstone, iron(steel) doors are usually made for adventure map/servers that requires redstone circuits.
That depends on where you are located. In the united States, they are referred to as 'ties'; in the United Kingdom, I believe they are called 'sleepers'. They can also be Concrete or Steel, but wood is the Most common in the US. The are actually Thick beams and not planks, as they distribute that weight and hold the Rails parallel.
from what i know i would suggest 10k to be the the odds of it dropping visage
The raw materials required to make steel are a piece of iron ore and two(2) pieces of coal.You can smith these into steel through the use of a furnace or the use of the spell Superheat Ore.