Maybe you know all this, but since you're newbie and your question looks more like jumping in head-first, I feel have to write all this:

Mining bitcoin is pretty much a business. Mining machines are far from cheap and if your electricity price is not overly cheap you'll end up mining bitcoin more expensive than buying it.
So I advise you read more and understand better what you're planning to do.

Also, if you will have only one miner, you will probably use pool mining, gathering tiny amounts from each block mined by that pool, you won't exactly "mine one bitcoin" directly.



Actual miners would give you more info about machine and approximate time frame for getting 1 BTC (assuming the difficulty doesn't change much)