I grow cherimoya trees at home and since I regularly need to consult about proper care I thought I'd use my site to store all my online references. I hope you can re-use them too :)

Here is a very informative page on Cherimoya tree care: Cherimoya Tree Care

A good info on the origin of the plant, which will give you a good idea of whether and what chances it would have of growing in your climate: Cherimoya Origin

A video on pollinating Cherimoya tree:

An interesting detail that you might have picked while watching the video is that if grown in a coastal climate hand-pollination may not be necessary for setting fruit. Try it out and see what works for you. Cherimoya tree usually start fruiting in their 3rd year, so if you don't get any fruit after 3rd year, try hand-pollinating.

And finally a great video about pruning: