When you have a working contract, you can get some accomodation. Take your work contract and rental contract to the citizens' registration office (Einwohner Anmelden. Bureau de population registration?) with your EU passport and register there. It is up to the authorities to decide which permit you will get, probably a B.
You need to register for health insurance, monthly premium will be backdated to the month you arrived, so avoid arriving on the last day of the month!
http://en.comparis.ch/krankenkassen/default.aspx
Ask your employer to register you with the AHV or AVS. They have to deduct income tax and pay it for you.
Ask employer for a signed monthly statement of salary and deductions for income tax, unemployment insurance, AHV/AVS contributions, plus a few others.
There are two essential books to read, the first is your reference bible, the second helps you understand this country,
http://www.amazon.co.uk/s/ref=nb_sb_...land&x=12&y=15 http://www.amazon.co.uk/s/ref=nb_sb_...d+island&ajr=0
I have a 22 year old son and a 20 year old daughter living here, contact me if you will be living near Bern.