Zero idea but want to be day trader
Day trading is not the way to build wealth.

Heavy day traders earn gross profits, but their profits are not sufficient to cover transaction costs. Moreover, in the typical six month period, more than eight out of ten day traders lose money. Despite these bleak findings, there is strong evidence of persistent ability for a relatively small group of day traders. Traders with strong past performance continue to earn strong returns. The stocks they buy outperform those they sell by 62 basis points per day. This spread is sufficiently large to cover transaction costs.

Since 80% lose money over 6 months period, do you think you are that 20%?

... You need to do your own homework. Lazy Google but want to day trade?

Minimum is 1 board lot (i.e. 100 units). If Maybank stock is RM8, you need minimum RM800 (RM8 x 100 units) to conduct transaction. Subsequent purchases is in multiples of board lots (i.e. 2 board lots which is 200 units).

There is odd lot market (<100 units) but the spread is very high and often nobody buys from there because there is an additional fee for buying and selling.

Yes free. But for US citizens only.