I'd sell them one at a time on ebay. Buy it now with offers, never auction them unless you have dozens of followers. Do your research to see what individual coins will likely sell for by researching sales in advanced search, click on "sold" items. Common Morgan dollars that are cleaned may sell for $30-$40 or so. No problem AUs and Uncs. will probably sell for around Greysheet. GSAs and better dates, should do quite well. Key dates need to be analyzed accurately on grade to determine at what price to list them.
I'd never think of trading or selling as a group, good way to lose a lot of money.