For scalping trading is seem better to do that in platform that offer profit not only from uptrend but also from downtrend. Many platform created trading product called CFD/Contract For Different that is trading with margin that we can make profit from long and short potition.
Scalping is very risky and then scalping on a leverage trading platform again is even a lot riskier. You really do not have to trade on leverage platform before you scalp, as you can simply do that on a normal trading platform depending on the level of risk you are willing to go with. I understand that sometimes, shorting the market as well can be a good way to get some extra profit on your trade. For scalping, I have always been an ardent lover of Stoch RSI and Moving Averages, alongside volume and that is always a good one for me.
You only need to use short term period for scalping method ( 5 min - 30 min - 1 hour ), why not use 1 minute because too short and nothing you can do in a minute.
1 minute is actually not reasonable and I wonder why it is even available on exchanges anyway. You have named very perfect indicators for scalping and these are basically the ones I use most of the time myself and I have been able to do well with it over the years. As long as you remain with your strategy, you are principled, you know how to manage your funds appropriately well, and scalping can actually be very rewarding.