Electrical Problems.

I just had some interior work (re-upholstry) done to my car and when I got the car back there was some electrical problems:

1) Right front speaker doesn't work.
2) Backup lights don't work.
3) Turn signals don't work.

I think it could be a fuse...but I'm not sure which fuse to check because I have no manual.

Please help?

If it was my car and I paid to have some work done to it. I would run the car back and tell them you will pick it up when all the stuff they fu%#ed up is working again! If they did some interrior work they messed something up and caused a short.