My Experience:
I don't water my trees at all but my soil (loam/peat)is almost perfect for growing. It also holds moisture real well. As far as watering goes it really depends on, your soil type, the weather conditions for the year planted and the two consecutive years after planting. Thats what the experts have told me.
Its a tight rope the first couple three years...water too much and the roots remain shallow and the tree will strugle or die during dry years...water to little and the tree dies.
Herbicides/Insecticides for fruit trees ...a whole forum could be built on those topics.
I use mostly organic methods but most of my trees are for wildlife.
I am very fortunate to have a great tree nusery and an experienced fruit tree grower very close to my property. If you can find one next to you it is worth the premium that you will pay for the trees, especially if you are only planting 6-12 trees. IMHO
Potted vs. Bare Root. Differing opinions on this one. In my experience my loss on bare root tree's 1 in 4. Loses on potted, zero. I think with good stock a potted plant, although more expensive, gives you a better chance for establishing the tree. Some will argue this for sure.
Ok...I will stop typing now
