Setting up a new salary cap dynasty league on Fantrax with proboards and I am looking for advice on how to deal with players not drafted in the inaugural draft. I like the idea of them becoming free agents that anyone can bid on but I am not sure how to manage this and what rules to setup. What I am wondering is:

How best to have people make offers for the players? Should they post on proboards their offers or does this need to be done privately?

Can anyone bid any amount for any player or do they need to offer a minimum amount? As an example say a player like Toewes goes unsigned because he has a $10.5 million dollar contract, how would a team go about bidding on him as a free agent? Could they offer any amount to sign him or should their be a minimum salary required?

Any advice on how to handle free agency is appreciated.

Thanks