Dave just take your time mate, I'm sure you will do well with her, that whistle is ideal, I use a long blow for the stop, double pip for a turn and repetitive blow for a recall.
None of this is needed for a while, you could use the recall one when your putting the dogs bowl out, associate the sound with someting pleasurable and instill a nice recall.
If you ever need books give me a shout and I will sort them out cheap for you, I have a few books around the place.
The key to the whitsle is to keep it nice and soft and quiet, aswell as your voice, dog will tune in more, that my advi