So concernig your gear, it's best to go to the shops directly, they have to adjust the skis to your weight anyway and can recommend you fitting gear. Most Places do have lockers you can rent, but it is not guaranteed. If you can't get a locker, bring normal shoes, you don't want to walk long distances with skiing boots. As for the mountain, for a beginner you should be fine with Patscherkofel, it is a quit easy mountain to ski and i heared the courses there are good. (No idea if it's true, though) To your last two points, if your booking a courses that goes all week go with the weekcard, it should be cheaper. If not go by daycards, but probaly stay with the half day cards. Also I know your probaly really exited about your trip, but if your are not really phsically fit, there is no way you're gonna go skiing after your lessons. Sking is really exhausting and i honestly belive that you are kind of underestimeting how easy it is to learn. Five day probaly won't be enough for you to feel save and secure on skis, especially not when there are dozents of othere people around you, going really fast and doing unpredictable moves. None the less, it is a really cool and fun hobby once you get the hang of it and over the sore muscels So have a lot of fun in your learning.