I don't get it. If you're still a newbie, why are you finding a buyer here in forum? Do you already knew the basics and fundamentals about bitcoin?

If you have a hefty amount worth selling, you shouldn't be looking for buyer here in forum because you can't be so certain that the person you are transacting with is legitimate. I suggest you look into platforms that provides security for both seller and buyer. That way, you won't be worried to be scammed. There are several platforms that worth the trust such as binance. You can look it up over the internet and try to learn its interface first.