1 check the pilot program website and apply there, you will find the instructions on what documents you need,
2 you'll do a pilot aptitude test you can search this thread and online for more info,
3 it's decent if you don't have 100k+ lying around
4* via the website!
5 of course there will be a course that starts every two months, again you can find all this on the wizz air website
good luck