Should I apply for a joint account or an individual on a line of credit for wells fargo?

-I don't have any credit, i'm self employed with about $320 a month with no way to prove it, and I'm only 18. If I were to apply for a line of credit with wells fargo, would i be able to get the money? Or should I do a joint account with my sister. She has a great paying job, but bad credit, and she is 25. Would i be able to get it?



Also, what if I joined with my brother, he has a job as a loan specialist, but he is on paid leave because he got robbed twice at gun point, but no credit at all. And no, he can't give me a loan because the company he works for has terribly high interest rates, so he wont give me a loan. But could get a loan if I did a joint account with him?