Soy(a)bean - Tankaro

I purchased some soya bean seeds (tankaro) from the US with the view to grow them for edamame.  They didn't come with any instructions, except to plant as a normal bean bush.  I was planning to start them off in the propagator and then grow them in the greenhouse to give them heat.  Is this viable, and when do you think I ought to start them off?  It does say they'll take 70 days.

Any advice is appreciated

Yes, I had already searched, but as these are a variety not specifically tailored to the UK I wondered if anyone could offer more specific advice, as I'd planned to grow them in a greenhouse rather than outside. 

I'll just give it a go in April and see what happens!

Growers here stay strictly with growing time varieties because soybeans just don't like the cold and if you get a long grow variety (eg 120 days) it just won't ripen before frost takes it down, so in the UK stick with the shortest growing times you can find like 70 days. True the plants will be shorter and the yield smaller but its better than tall plants with no yield. Not sure how they'd like it in the greenhouse but you can always try. The key is lots of sun for them and reasonable warmth. And definitely warmish soil for planting. They're susceptible to mold so you'd need to be careful with venting.

Pea & bean innoculant is what is referred to, not mandatory but it does boost growth. It can be grown more closely in raised beds but not overly close in rows that mildew/mold can set it. In dry times, mulch is a definite benefit. Otherwise, water regularly.

Do note that rabbits and deer adore edamame so if you have them as pests, fence the crop in well.

Here's a short video on cultivation.

Here is some cultivation info, and there's a bit more here as well as here.