I think you need to test a system ON PAPER (not with real money) first. Then start trading it with a
demo account and only then use real money.
The system needs to do TWO things.
1. It must have positive expectancy. That is, more money comes in than goes out over time. Do NOT expect every trade to be a winner because there will be quite lot of losers even in a profitable system.
2. You need to work out, by back testing, what the maximum drawdown is. It's no good being profitable if you get the occasional drawdown which wipes you out completely. So you need to know your maximum drawdown and can adjust your leverage to suit this.
As for an actual system, I'm no expert and in fact I'm still working on mine but the above two points are certainly what it needs to do. How to do it is the problem but you MUST work out a system BEFORE you put any more real money in the market.
You shouldn't trade with borrowed money. So, pay off the loan, save some money and during this time study in the evenings about fx. Then come back with some saved set aside money and try again.