Make sure the Yashica has had the POD addressed and confirm that it meters correctly with a modern battery (you'll need to buy or make an adapter).
For film, 400 for daylight, push to 1600 for dawn/dusk or darker (this may be an issue with the Electro 35, as I can't recall if the ISO setting goes past 1000; if not, you'll have to adapt your developing), f/8 for summer, f/5.6 for every other season, pre-focus at 10ft/3m, and go for it. You can shoot almost instantaneously this way, and shutter speeds will be fast enough to limit shake.