1. like previously mentioned, it's not too late to plant/transplant. the soil is still warm so you'll get plenty of root growth before next growing season.
2. being that you've never grown hops, it would be a good idea to keep them farther apart rather than closer. i've had rhizomes creep out 3 feet from the crown in one season.
3. give them a good drink when you plant them and then cover them with a couple inches of mulch.
4. it's common practice to remove the first growth for the first few weeks and then pick a few sturdy ones to climb and produce your crop. if you have 'crowns' that have grown for a year or so, things will go very well for you next season and you should have a good crop. if you just have some rhizomes, you'll have to treat them as first year plants and it might be a good idea to allow the majority of them to climb in order to produce a bunch of carbohydrates for the next year. it all depends on what the guy left you. no matter what you do, i feel you'll have 'something' growing next year.