Q: Should I book hostel for myself?
A: Yes, you have to do so.
Q: Are there any preparation materials I can take into account?
A: http://nbviewer.jupyter.org/gist/rpmuller/5920182, https://www.codecademy.com/tracks/python, or you can have a look at the materials from MLHEP-2015 (github), MLHEP-2016 (github), MLHEP-2017 (github).
Q: Is there any financial support available for some of the participants?
A: Yes, a very limited support is available, thanks to our sponsors. Please provide as much details as possible about your case in 'comments' field of the registration form. Include why you need the support, how you will benefit from the school. Also please send us a reference letter (see email on the left).