1.) Which time frame you suggest for scalping? Currently, using 1 min. 5 min. would be better?
I am not going to dictate on which time frame you use, mate, because all of us have different strategies for different coins. In scalp trading sometimes I use 1 minute, other times 3 minutes, 5 mins or 15 mins
But my risk reward ratio is at least more than 1.5 to avoid the trading fees eating up my potential profits.
2.) I am using Levarage 10x at the moment. What do you suggest? Like 1x leverag.
Again, this also varies depending on how volatile the perpetual contract is. My prime focus is on the risk reward ratio gauged mostly after looking at the potential resistance and support levels
3.) Instead of using Markets orders, it would be better to use "Limit" (including order price)?
You can use limit orders when taking profit. In scalp trading, it's hard to use a limit order when entering a position because every second matters. So, for entry and stop loss, you can use market orders.