Tips for a new trader?

Hello! My name is Fabricio, i live in Brazil.
Last week i had a lot of lucky openning two cases. That's because i got a Bayonet and a Stattrak Glock Rebel.

I posted it on a trading site and since then, i got a lot of guys friending me and trying to scam me.

What i need to do to find a good trader? I just want to get my money and send the items to the buyer, but, it looks sooooo hard!!!

I am going to receive the money on Paypal. Is there a way to be sure the money will not be taken from my Paypal account after i send the items?

At this time, this guy is the most trustable i found:
http://steamcommunity.com/id/daaaamndonald/
How can i be sure that he's not going to steal my items?

Thanks in advance!

you probably mean his profile rep...

here is what we think of that: http://forums.steamrep.com/threads/what-constitutes-reputation.12391/

There is no way to guarantee that someone won't take their money back after you trade them your stuff. This is why we need to look at a few things before even trying to trade.

http://forums.steamrep.com/threads/what-constitutes-reputation.12391/
This guide shows what most legitimate traders mean by reputation. Any +rep comments on a steam profile are worthless. (I'm gonna get ninja'd on this one.)

http://forums.steamrep.com/threads/safe-trading-practices-extended.119029/
This guide shows common scam methods and should give you an idea on what to look out for.

If you decide to trade anyway, keep some unedited screenshots of any chat you have with the person you traded with, your inventory history, and your paypal history. Those might be useful should you need to create a scam report.
Good luck and trade smart.

There many ways, check his SteamRep and make sure he's not scammer. Google his name, past names, skype and anything you might find something wrong.
But of course don't let wrong things to confuse you such as reps on steam profile (can be fake), levels (can be bought), pictures (can be fake either).