Read about random.dat and about using unsigned and create some new RS2 accounts if/when you plan on autoing. That way there is no risk for any actually good stats.
Also, either find some working and recently updated free-for-all scripts (if there is any), or get JRs (read a tutorial on ranks) and find a good script :).
Look around the board for tutorials about anti-ban type things (like using multiplayer).
EDIT: Jeez, I guess I took too long to post, I started typing like a minute or 2 after you posted.
EDIT2:
Ok thanks for the help.
How long should I test the test bot army for? Until they get banned or just for the regular autoing time (1-2 hours)?
Depends how many characters you have, if I have over 5 players I run for as long as the script runs for.