I've grown hops in upstate NY since 2012. In my ignorance when I planted, I never read any books. I can't help with any recommendations there, but I have learned a lot over the years by making mistakes that hopefully will help.
* In the beginning of the year, I train 4 bines on the string, as early in the year they are very tender and can snap. Once they grow and are sturdy, I snip the smallest bine and leave only 3 per plant on the string. You have to be diligent early in the year to trim all bushy/horizontal growth at the bottom of the plant, those will not produce much if any hops. You want the plant to focus on its 3 main bines to promote vertical growth.
* I've read/heard that snipping the first growth then training the second growth that comes up a week later promotes more yield, but I have not found this to do anything in practice. I just start training them once they pop up.
* If the top "head" (I don't know the technical term) breaks off, cut off the whole bine. It will stop growing vertically and will focus on bushing out, reducing your yield.
* Coconut string is the best I've found to promote vertical growth (what produces the most hops).
* I have grown; magnum, sterling, Mt. Hood and centennial in my region. Centennial produces the most yield and has the best flavor profile in my opinion out of those hops.
* I don't spray my plants with anything, they are in a somewhat breezy spot which I think has helped me over the years. If you are in a wet, not-windy area I could see mold being an issue. Japanese beetles have been the worst destructors over the years, so I have used those bags that smell terrible to trap them which helps during the years of bad beetles.
* I was dumb when I planted them and put different varieties close to eachother. With the maturity of these plants now, I have no idea what is growing until the cones start producing and I can use my senses to judge. If you are trying to plant different varieties, put them in different rows or far apart from eachother.
* I have a main steel line at the top and a lower steel line that is 6 inches off the ground. When I tie my coconut string to the top, I tie it off at the steel cable at the bottom and leave a "tail" of coconut string to help me train the plant to grow up on. If your row is oriented North/South (like mine are), make sure to train them to grow up on the east side of the bottom wire to avoid them scraping on it when it's windy.
* They like to be drenched once a day as long as it's hot out. I'll water them less or skip a day if it's been wet out. I use a trickle hose to water them.
* If you want to nerd out, I've found Cornell has some
good online resources.
In general, don't worry too much. Keep the beetles off and you'll be fine