Baby's first Credit Card?

Hey guys, I could really use some advice. My income consistently fluctuates (I work anywhere from 10 to 27 hours a week sometimes) and I keep finding myself in need of money that I'll make later. I've been borrowing from friends (and paying them right back, no problem there) for a few years now. I have some bigger expenses like dental that I'd like to take care of but don't have the CURRENT funds for and I'm wondering what my financial options are and what the best one is (line of credit, card, loan?) Etc. As it currently stands I'm with CIBC (a debit), have no credit score, and would very much prefer something easy to get accepted for and with low interest. Any advice at all helps. Cheers!