I've had a few trees fell before, they were big and I didn't want to mess them up, so I did some research and asked some experts.
Here are a few things I would recommend, have it fell some time between fall and winter, because the tree would be less saturated at that time making it easier to handle and transport. Then I would seal the ends like everyone suggests (I prefer anchor seal over anything else) and I use one of those pump spray bottles like for gardening.
Then here is where the options change, if you have a place to store rough sawn lumber for over a year stacked out of the weather would be one option. Another option if you had no place to store rough sawn lumber outside but had a place to keep the logs, you can leave them in log form for years (depending on the wood of course) until you had a place to keep all the lumber. And another option would be to have it milled, dried, and placed in your shop.
Either way I've found that when it comes to felling and milling, limitations end up dictating our choices in these matters. Preferred method would be wait a least a year before you mill the log, then once milled, stack and air dry, which if stacked correctly will give you the least amount of movement in the wood, and often give you a richer color. Air drying rule of thumb is one year per inch, and after wards you can start bringing it in to continue drying. Usually best to have the wood between 7%-10% moisture content, most furniture makers prefer 7%.
All that being said I'm not an expert at this by any stretch, but I have had dealt with about five trees so far ranging from 24" diameter black walnut to 10' diameter maple.