Kinda lost job wise right now...needing some help figuring out how to work out days between two part time jobs...

So, right now I currently work the one part time job (really close to quitting, but that isn't what this post is about) I currently have open availability at it, but I seriously need a second part time job (not just picking up any free hours from another Dollar Tree because I can't go over 40 total hours in a week :( even if it is a different distract) So, I'm looking into seeing about getting a second part time job, but I don't know the best way to make the days work out between the two jobs... so how do I split the days between the two jobs once I find a second part time job??? Assuming I can't find another full time job and have to deal with two part time jobs to make a full time job income for a little while work. Because I'm tired of not making enough money and having to stay under 40 hours a week between working two stores when I need the money coming in to pay bills and other needs like getting my moped fixed, getting a new phone, paying back a friend that I owe money too, building a savings again, etc...