Hi dbstepp, welcome to the forum!
I have to agree with Greg! The first step would be to take of all aerators and let the water flow for a good 20 minutes to clear the gunk out. This includes shower heads and all other faucets. Shower heads may need to be replaced! If there is too much gunk inside the shower head, there is no saving it.
I'll add one more step, because I have no idea where you're located. If the water is still not coming out, ya have to check under the home for leaks! This is very important in a home of your vintage. Those of us with older mobiles need to keep water damage minimal. We all have a good portion of our homes, if not all, that have particle board subfloors. When water mixes with our floors, it turns to sawdust quickly.
If the aerators aren't the problem and you have no leaks, then move on to Greg's suggestion. Like Greg mentioned, replumbing with PEX is the best option.
Never discourage anyone...who continually makes progress, no matter how slow.