I spent all my money on booze and take away food
Decent food it way more expensive than you expect so try not to buy stupid things (booze, pot, etc) or too much food so you wont be able to eat it before it goes off.
Secondly washing your clothes if fucking hassle so get used to wearing the same stuff for several days in a row.
finally if you are moving in with other people make sure they are not complete tossers.