Thank you all for constructing tips/advises.
After reading links that were directed, I was thinking to contact most reputable escrow users here, instead of going to 3rd parties, who could help me to start selling some items.
If you want to use reputable escrow/s here in forum you can go to this thread
https://bitcointalk.org/index.php?topic=855778.0 listed there the trusted people here on forum. Others have some free services but most of them do have 1% fee which is not that too high for a starting business person like you. Good luck to your selling business here.