I started my business with less than 5k pesos! With your capital of 20k pesos well I don't think that a mini store will do. It takes up to 30k to 50k to start that. Just research on something that is consumable and affordable like food, that's one way to start your business. Also think if your market will be interested with the business you want to start. In my case for example I am into health products, so what I do is research on my products beneficial claims and go to training to promote and sell my product more effectively. Also for 20k u need to project the monthly operational expenses so it is not enough. I suggest start with a business with leverage as a main tool to start. There you can practice your entrepreneurial skills and potentials then if you are earning you can start with a bigger business you really want.