Dave

Pruning gets tricky in that there are lots of pruning guides around the web, but they are just regurgitated conventional wisdom minus the really important details. You should read on this or any other good forums starting now and look at your trees frequently and only mentally prune them, you will get the hang of it by the time late winter comes around and you can do a good prune job. You need to be able to look at the tree and know why you are doing each cut and what the result will be. Of course this is if you want to maximize them. they will grow and put off some fruit with no attention.

Don't fertilize with commercial product unless you determine it is needed. I read more about trees being burned by fertilizer then ones that need it. Although some people live where the soil sucks and fert is a must.

otherwise stick around here and read and ask stuff

Pear - Pear can be small. Wait until late Sept to see if it sizes up or going to ripe at all. Pear is easier to grow.

Apple - since you don't know how old the trees are and what rootstock they are on, it's tough to know when they will fruit or if they will fruit (if no cross pollination). Wait till next spring, they may flower for you. Growing apple in New England is not that difficult.

Cherry - I don't know if you have sour or sweet cherry tree. Sour cherry is easier to grow. It has fewer problems than sweet one. If it's sour cherry, birds could be your only issue.

Don't know anything about grapes but see them growing wild all over the place.

Like cckw said, read up. This forum has a lot of good contributors. Go to Search at the top of the page and search specific info you want to know. Most issues have been discussed and answered (many times).

I don't know where you are in NH, I have a friend in Hampstead, NH. He knows nothing about growing fruit trees but planted apple, peach, cherry in his front yard anyway. He does not have any problem and no spray at all. His worry is squirrels and birds. Make me want to move to NH!!!