Indians For Guns

Hi,
I am in the process of getting an arms license under the crop protection category.

I understand that only Muzzle Loading and Breech Loading guns are permitted under this category.

Can someone give me the low down on the ML and BL types of guns..where can I buy one ..cost etc..ease of handling and whatever else goes with the type of gun I am allowed under the mentioned category.

Thanks
Cbhan