Hi Brians,
I can't answer all your questions, but I will address what I can. You could plant them all to harvest and not have to worry about getting offsets. Just plant them all and harvest what you like as everbearers don't produce many runners with offsets. You can overwinter them as well. I don't know where you live, but you may find this site helpful. It's in Canada and talks about overwintering.
http://gardenline.usask.ca/fruit/day-neut.html
Here's more:
http://www.urbanext.uiuc.edu/strawberries/growing.html
http://www.ipm.iastate.edu/ipm/hortn...8/plantsb.html
My greatest concern is the Preen you plan on using. Why in the world would you use that, especially with something you would eat? Maybe if you read this you will change your mind and just rely on the newspaper and hand pulling weeds.
http://forums.gardenweb.com/forums/l...463913628.html
Regards,
Newt
When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant.