Which dilution ratio are you going to use? I would use this developer as a one shot deal., if you mix the whole bottle as they would like (being the golden god) it will oxides quickly.
You can use the same fixer type for both paper and film, altho , many use a different ratio for each; ;unless of course you are going to print to archival standards. Check Ilfords pdf files on their site for specifics.
With regard to stop bath, there are mixed reviews on using stop bath for film, that decison can be influenced by the type of developer. Usually, a stop is used for paper unless you are using T-4 fixer which does not respond to an acid bath and needs running water.
With fiber, washing is always longer, again check ilford for some guide lines for archival washing processes. However, it can be reduced by using HCA.