What should I do?

My sister who wants me to babysit her child for a while, so does my 3year studying goes to waste? She is probably going to make me look after him until he can walk and that is a long time away still.

So what should I do?

Part-time job with flexible hours? Be a full time babysitter?

I am pretty confused. I do not mind helping out my sister with babysitting but as a full-time job? So my studying of Accounting-Information Systems there is no point for it?

I hope I do get a job at Sainsbury's, as it is part-time but I could hopefully do over-time. As it could provide me many opportunities for me due to my situation for the time being. I would have to get up extra early but I would do that to work at any job.