I have a few pop collectables, that I am willing to sale or trade, will it be easier to do so here?

They don't trade. They sell. Sell your stuff on ebay or offer up.

Yes. Know what you want for them ahead of time. Don't expect to profit.

Theres a lot of vendors aome buy some will trade the rest sell only

Depending on the vendor or put them up on offer up.

There are quite a few vendors at FS, IDK if the trade or buy.

Yes. It just depends on the vendor.