Turn signals not working.

I have a 72 duster 318. The cars turn signals stopped working seemingly when a bulb was broken for the rear tail light. However through trouble shooting I have some instances to present. First, I have hot going into the 4 way flasher at all times, dimmer on the out wire. Second I found a bulb next to the 4 way flasher button on the column to be black and blown out. Third,with the brake pedal applied when I turn the turn signal on for the according light, the brake light for said circuit will turn off but no flashing will occur. I believe that is correct for the brake circuit? Fourth, I don't believe my front signals even worked when the rest of it worked? Fifth, at one point my fuel gauge worked irradically, but no dash lights or gauges currently work. (Speedo just does not have the cable in currently. We'll get there on that) i considered changing the temp amp and fuel to after market electrical anyway. I'm really just looking for some absolute guidance on this situation cause I'm a bit lost. Any suggestions of where i myself fudged up and am not thinking correctly? Or where I should test next?