Don't worry too much about how many replies you get from your leaflets at this stage in the game. The secret is to get on and deliver as many leaflets as you can and I am talking about thousands.
The rest will follow. Don't necessarily expect an instant response from leaflets, I have had replies as much as three years later.
If you deliver leaflets in November time its quite likely they won't phone you till the following Spring.
The simple fact is if you deliver enough leaflets you can't fail to get the customers you want eventually.