A nice little site, that deals with the planting, pruning, and feeding of trees, with care during the Winter months. BTW, always worth it to have a pro check your trees out for advise and safety concerns and issues. Some of the chemicals that fight different tree diseases, and bugs is also bad for people-pro's handle this stuff, and it may be wise to have a good pro advise you initially and give a few pointers!
http://www.treehelp.com/howto/index.asp