Law / Regarding Entering Poland - residency and travelling to other Schengen countries [19]

Hello

I have just received my work visa for Poland(am a Non EU) , and have some questions regarding the same.

1. How to obtain a residence permit once I arrive in Poland?
2. What is Cel Wydania - 05,06 ,07 means ?
3. Can i travel to other Schengen country without residence permit (my visa is stamped as multiple) ?
4. How soon should I register at local authority for residence permit once I arrive Poland?

Thanking You