How I can let you know I'm interested in taking your commission, and to confirm any details like timeslot or give updates. Please specify if it's a Twitter handle, FurAffinity, email, etc. (I prefer not to use Discord since it requires the extra step of adding people as friends to communicate outside servers, but I can use it if that's the only option.)
(Also, given the state of Twitter recently, if your preferred method of contact is Twitter please provide at least one backup contact in case it has outages)