Starting an online store, need advice

Hello,
My budget is 3500 Euros, I made myself a small plan and it goes like this.
2000 Euros on a stock as I want to own the stock because the store is targeting people from only one country and the delivery time to be as small as possible. The niche is woman clothing, I choose a big niche because I want to go on profit in the first month, a lot of competitors I know but there is room. As I said 2000 Euros, the rest 1500 Euros will go in fb ads and the rest in expenses. I'm a bit afraid…

Starting an online store, need advice