I can think of two particularly important issues for you to address,
1. Pest Control ...
- what pests do you have in your area?
- what pests are specific to cherry trees?
- how will you keep your orchard pest free with organic methods?
2. Soil Reclamation ...
- how will you start to rebuild the soil ?
- what chemicals were used previously that may affect your attempts to reclaim the soil?
Off hand I'd recommend some basic permie knowledge such as...
comfrey - plant comfrey at the base of your trees to deter pests and to insure the plants around your trees will not be competing with the trees roots
AACT - actively aerated
compost teas , these are essentially super powered innoculant a of microbial life
Mycorrhiza - this fungus is an essential part of building life in the soil, the fungus will form a symbiotic relationship with the roots of your trees facilitating the exchange of positive ions to the tree in return for negative ions for the fungus. This exchange is one of the most important aspects of soil life.
Edited for typos.