How do you level your account ???

https://www.steamgifts.com/about/faq

Scroll down to "What are levels, and how can I increase my level?"
That should answer it.

so I have to create giveaways and give away games

yes h2ofive

Basically, you buy games that can be activated on Steam and have never been given away for free any time in the past and give them away here. You gain levels based on the value of the games you give away. It is a bit more complicated than that, but you can find everything explained in the FAQ. You may also want to read the Guidelines.

Welcome to SG :)