To purchase an Option, you will need to pay the premium plus brokerage charges. Options come in different lot sizes, which can vary from stock to stock. You would have to pay a premium for 1 lot, regardless of how many shares it contains. You would need to keep a certain amount of margin money in your account when you sell an Option. This will be determined by your broker or exchange.
It is best to invest small if you're just getting started in Options trading.