If this is german, are the instructions listed as to how to use this, and are instructions in english? thanks.

The instructions are in German. But the website has a clear description. You need to know the ratio of sugar to fruit in order to achieve the correct consistency in the jam DescriptionWith Dr.Oetker extra gelling sugar 2in1 you can make delicious fruity and less sweet jams and jelly. For a package extra gel sugar (500 g) you need 1000 g of fruits and/or 900 ml fruit juice. Dr.Oetker extra gelling sugar contains the vegetable compound pectin, which is won from apples and citric fruits. Since the compounds and the sugar are already mixed, the preparation is fast and simply - ideal for beginners. Surprise your family with homemade jam or jelly!

What is the shelf life of product?

When I got it the shelf live was about 2 years. But I have used it without problem when the product was well over the best date of use. I stop using it when the package gets hard due to moisture.

how much do you need to make one of strawberry jam?

To answer your question I assume a 12 oz Glas jar as we use it. With 1kg of strawberry we get 3 jars (and a little leftover perfect to go directly into a yoghurt or quark). So for one 12 oz jar we would say you roughly use a third of the sugar (166g).