I used an
Altura Nevis for my Jogle ( probably equivalent to the Night Vision waterproof) but have since upgraded to a Goretex jacket. You can get days, especially in N Scotland, where it just rains all day long and you get wet and miserable. If you can afford it, it's worth spending money on a decent waterproof.
I wouldn't ride in zip off trousers/shorts. You can get arm and leg warmers in warm, fleecy Roubaix fabric. These don't take up much room and keep your arms and legs warm on a cool day and they can be easily removed and stowed. Aldi sell them when they have their spring and autumn bike stuff sales or
Decathlon do cheap ones too.
I took a pair of Craghoppers to wear in the evenings.
I wouldn't bother with a turbo trainer either. Just get out and ride, on the road, as often as you can. I was doing about 150 miles a week on average, in the build up to my JOGLE.