i am having troubles finding  where to look for females to breed my 2 year english mastiff with.. can you help...?

The very best way is to show your dog successfully and then you will be approached by the owners of bitches to use him. That would be after he had had all the required health tests. Before you decide to use him at stud ask yourself why you would want to do so, if is not as straightforward as it may seem and you will have legal as well as moral responsibility for any pups produced.