Just submit them with the names qualified in alphanumeric order. Let's say your serial epic is FAR FUCKIN' OUT. Write and submit FAR FUCKIN' OUT 01, then FAR FUCKIN' OUT 02, and so on, ordered as 01, 02... 99. (Oh fuck, 99 chapters!) Or they could be FAR FUCKIN' OUT: ANY WAY IN, then FAR FUCKIN' OUT: BEFORE TIME, then FAR FUCKIN' OUT: CHASED AWAY, ordered as A(ny). B(efore), C(hased), etc. I use numbering for actual serials, and alphabetic titles for fairly standalone episodes.