Eric, can't help you with the sweet potatoes but Philip gave great advice. May be able to help you with strawberries. Our Zones are equivalent, and I've grown strawberries for as long as I can remember, NOT THAT THAT MAKES ME AN EXPERT - I could be doing the same thing incorrectly, for all those years. However, first I suggest you pick out what variety you want to grow. You probably have researched this already. Basically, you have two choices, once fruiting, (early-mid-or late) or everbearing, (all season fruiting.) Either type, plant as soon as the ground can be worked, (Note: a lot of lattitude in "as soon as the ground can be worked" , but wait until the soil warms up a little in the Spring, where we are and the only time we can buy plants anyway). I prefer, the everbearing, offered here are: "Albion" or "Seascape". In the US, you have additional choices. Both of these offer huge, conical berries. In Nova Scotia, there are numerous u-pick strawberry farms, but I noticed in the last two or three years, a bunch of these farms have switched to "everbearing" or a combination of "early" and "everbearing" to drastically extend their season. Purely personal taste. I'm certain you have already read up on growing strawberries, i.e. not burying the crown, planting so that the roots spread out below the crown in a conical shape, picking off the first flowers (I seldom do that, but that is the suggested way), limiting the off runners or "sisters", fertilizing, and watering frequently, weeding, mulching with straw if available, etc. Not rocket science! If I can do it, it must be fairly easy. LOL. There are predators!! Chipmunks, Pheasants, and slugs.
All strawberry plant here are sold in groups of 25 as a rule, straight out of a cold refrigerator, bare root. Go for it! Cheers!