after market head unit

Ok, so this is what happened from start till now. First my truck would not start sometimes, turns out it was just a bad grounding cable, so i got a replacement, go to hook the batter back up, but I put the connectors on the wrong terminals and the horn starts blowing, sparks and the whole 9...

Hello, I bought a new head unit which has all high level outputs for speaker but only RCA for the sub, I im waiting to save up for a nice sub and amp set. till then I was hoping I could connect my stock sub to my head unit but I do not know how to convert my 10 pin high level and to run off a...