I really want to get back in my garage and get stuck into some work again. There is so much to do but I just can't face subzero temperatures - even though I am Scottish

With due account of health and safety, what have people found to be the best:
a) heaters - e.g. space, convector, etc.
b) insulation - garage roof, walls, doors?
c) door/window sealers
d) flooring - concrete, rubber tile, carpets, etc.