I'm thinking of charging to take pictures for some people
Why would you want to charge people for photography?
I feel I should be entitled in charging in order to get back my time and effort
It's a good idea to charge for your work. Working for free won't help you to pay your bills. It shows that you know your worth when you charge for your time and talent accordingly.
I don't want to think about cost entirely. I want to make some money with it so I can buy what I want.
It's responsible of you to charge for the work that you do. This will help you to purchase the things that you desire.