Welcome to the board, Foolish Lad!!!
If you want to complete get rid of your old characters, you can try deleting the roster.dat and gamexx.sav files. If you don't mind them hanging around while you create new characters to play do the RESET ADVENTURES in the game options screen. There are advantages to keeping old players around - you can use their better equipment for the newer characters or at least trade off their gold.
Keep us posted on how you are doing!!
Wyv