Mustrum_Ridcully
Legend
I suppose at low levels, you will need to use mostly Minions and occassionaly a regular monster as a kind of "boss".
At higher levels, you might want to use more low level monsters.
Avoid abilities that make it impossible or very hard for the PC to act, as Firelance mentions.
Consider the option of the player running two characters or at least being aided by NPCs. I would still suggest the player controlling those NPCs, otherwise you end up playing with yourself a little too often (Attack rolls between DM controlled creatures is pretty... boring overall. Even for the DM.)
At higher levels, you might want to use more low level monsters.
Avoid abilities that make it impossible or very hard for the PC to act, as Firelance mentions.
Consider the option of the player running two characters or at least being aided by NPCs. I would still suggest the player controlling those NPCs, otherwise you end up playing with yourself a little too often (Attack rolls between DM controlled creatures is pretty... boring overall. Even for the DM.)