noob here about trading in SGX, or maybe in out of topic, does anyone has a rough estimate on all the fees/charges involved when executing a trade?

I.E. if I put down SGD1000 to buy a counter, how much of that will be charged away by banks for trading fee/exchange fee etc etc? same goes if you sold some shares worth SGD500 at SGD800, how much of the SGD300 will be charged away by banks?

Ado you guys put a "minimum" on the amount of trade you would make to make these charges negligible?