how do i become a better salesman so that ppl would want to buy my stuff

Depends on what you sell and the price, people mostly want stuff like 128 texture items and joints. Not really misc items like trails etc.

lol @ comehonorface. thanks ill keep that in mind. so how much should i sell vamp sec grad, torso, radioactive timer and text and head avvy

It's marketer not sales man.
You have to make thread in market,items section.
If you want to attach people then you could make a little shop with nice minimalistic banners.
After you made the shop,you have to know the prices.
Check the market prices for your items,and sell it for a bit lower price so people would be interested in buying.
After gaining some profit you can buy more items for cheap price and sell it for higher price.
Profit again.
And the same thing is with textures and art.
I hope this helps.

That helped me, Dad. Thanks.