I would also like to know what the average full time salary is for the following roles in Lodz (preferably with links to resources supporting replies):
System Administrator (GNU/Linux, MySQL, Apache/Nginx (including clustering), Postfix, Dovecot, CLI scripting languages (including bash, sed, perl) experience essential)
Programmer (development of applications for Windows, GNU/Linux, iOS, Windows Phone, Android and strong knowledge of cryptography essential)
Social Media Specialist (track record in promoting brands on social media including Google+, Facebook, Twitter, Tumblr, LinkedIn, Reddit essential)
All roles include a requirement to being able to competently speak and write English.
Look at tables, for example site 6. Most important words:
Stanowisko - position
Woj. Mazowieckie - Mazowieckie Voivodhip, for the full list of polish voivodships look here:
Najczęściej oferowane - The most common salary
And name of positions you can translate with dictionary in hand. Nearly half of positions is named in English anyway.
Value in table is gross salary in PLN. Unfortunately they don't have data for woj. £ódzkie, but it should be little less than for woj. Małopolskie and woj. Dolnośląskie.
3. Internet costs (high speed with minimum 100Mbit download & 30Mbit upload (symmetrical line preferable))
135pln/month for 50 Mb/15 Mb (they don't cover whole city)
they ask to call them
8/Mbit/8Mbit - 500pln netto
60/3Mbit - 80pln
250/20Mbit - 200pln
So it varies a lot and a lot depends on the building where you want to use it. Some places have access to more, some to less options. In worst case you will have only 8Mbit or 20Mbit ADSL
Also where can I get a PO BOX in Lodz?
Ask in some Poczta Polska office, they offer it.
Regarding setting company questions you could at least afford to consult with some professional.