What are your requirements as far as little prep time? I assume combat methods would be out of the picture, since you want to get into it fast.
There are still armies at Sorc Garden, so I assume that is still a good profit.
You could have your bots make cannonballs, tan dragon hides, make planks, make water/earth runes, mine pure essence, make house tele tabs.....There's an endless list of stuff you can do.
My recommendation would be to start them out on different things, that way you can not only see what is more profitable for you but also if one section of your bots get banned you at least have others that haven't been.
If you have any ideas about where you would be interested starting, I will try to help more.
Good luck