Guarantee deposit amount calculation

Hello everyone.
I want to start trading in stock options, but right now got stuck. I want to understand/calculate, how much cash will be frozen in my account as a margin/guarantee deposit. Can someone, please, explain it to me? With a simple example, if you can.
And English is my second language, so I am really sorry in advance for any confusion.
 
If you buy the option, the premium you paid is set aside.

If you sell the option, 50% of 100 shares is set aside.

Trading options without a local language resource is a very, very bad idea. You can lose more than your account value.
 
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