Hey guys I really want to do some marketing and get tc is there any tips? or how to do it

Just do it. Stay busy and don't obtain too big stacks of one item. If you do, it means you're probably buying that item for more than you should and you won't be able to resell back.

You can buy some items with low prices and then sell them with bigger prices in the market. It's not ideal, but without any ideas it's good.
Good luck.