If you don't want to go free hand there are 3~4 choices.
DMT aligner, Lansky, Gatco, Edge PRO (expensive one) If you are going to get a lansky make sure to get the deluxe diamond set.
If you want free hand and can shed out the $
Get a set of DMT diamond stones or if you want you can get 1 fine and 1 EEf to maintain edges.
If all you want is to maintain.
Get a sharpmaker.... A strop and/or a GOOD Chef's steel.
You need to add more detail to your OP.