Because you only opened the one side, sometimes you can just open the bleeder screw on that side and keep the reservoir filled up while gravity hopefully pushes the air out. Eventually only clear liquid will come out if you are very lucky.
This might give you enough pedal to get it to a garage for a proper bleed. Bleeding is a two person job. One pushes the pedal, the other is under and opens the bleeder as the pedal goes down. Then hold the pedal down and tighten the bleeder *before letting the pedal back up. Repeat many times until no air comes out while topping up the fluid.
Normally you start with the wheel farthest away from the reservoir, then work your way closer finishing with the front drivers side..
The problem is getting the bleeder screw open... You should start soaking it in penetrating oil. All the rest of them also for that matter, someone is going to have to open them. Then use a socket wrench on them.
On something rusted enough to not have a head on the caliper bolt, the odds of getting the bleeder open without snapping it are small. Then you need to change the caliper which brings you back to that bolt.....
If you have any gearhead friends, now is the time to get a case of beer and fire up the BBQ and ask nice..... It works lots of times, I had a BBQ last weekend when a few friends showed up to help me work on my Jeeps. Hey they even came back the second day for another BBQ and another fixit job.
I wish you luck.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's