This means diet is going to be way, way more important.
For training, pick any program that you like the look of on this site that fits your schedule. Follow it exactly as written, no additions, changes, nothing but what is written.
Just based in the tone of your post I'm guessing what you look like matter more than performance (which is fine) so pick something that'll do that. The Power Look program by Christian Thibaudeau may be good for you. Paul Carter has some cool stuff too.
Maybe. Some people find it helpful (I do). Some don't. You'll need to find out for yourself. If you think the added effort of counting and tracking everything you eat will be too much, don't.
This is a pretty decent starting point, although I'd just go -300. More sustainable. Plus, you'll be more likely to get good results from training that way. It does mean you'll need to count calories though.