It really depends on how big it is
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minecraft can use anywhere between 256 MB and 512MB of ram on any system.
In minecraft, it is necessary to build a crafting table. A crafting table lets you have a 3x3 crafting space to build in. To build it, you take bark, then put it in your personal crafting table in your inventory to get wooden planks, then use those wooden planks by putting then in your inventory crafting table, in a 2x2 format. Out comes your crafting table.
It depends on how many blocks you placed and how far you have traveled.
Minecraft shouldn't take more than 1 or 2 gigs of free memory if you are not doing much(example, mining, idling on singleplayer) If you are on a heavy traffic Minecraft server, or if you have a lot of mods, Minecraft could use from 4 to 10 gigs of free ram. If you are asking about hard drive, it can be around one half to one gig of hard drive space.
Typically, Minecraft usually uses 300MB + RAM - Usually about 600MB, but it is automatically allocated up to 900MB RAM (if your computer can handle that). Basically, the more RAM you have, the better Minecraft will run.