Moving to Cambodia - need some general info (insurance, bank, taxes..)

Hello! I'm a slovenian citizen and I wish to move to Phnom Penh. I had an interest in Asia probably since I saw the first Jackie Chan movie. Now I have the funds to make the move and I already know about the business visa, but I still need more details just so that I'll know what to do.

1. Is $270 for 1-year business visa all I need to live there? Is it really that simple? No other documents, no background or healthcare checks? Is 1-year business visa automatically a multi-entry one or do I have to tell them/check on the form? And where are all the places in Phnom Penh where I can extend it? What should I look for?

2. Besides personal documents, are there any documents or anything else required to rent and to open a bank account? What I'm particularly wondering about is the "tax number" that we have in Slovenia. You need it to open a bank account and they also asked for it for the renting contract. Do I first need to register at the Cambodian taxation office or can I just rent and open a bank account only with my passport and a 30-day visa (or if I can get a 1-year visa right on arrival)? And is there anything else I should know when renting, anything to be careful about?

3. Health insurance - can I get it at any insurance agency in Cambodia? I have that required health care that we have, but it only covers for travels inside European Union, and I don't need to pay it once I stop being a permanent resident. I am healthy but if I need surgery or dental work, will the insurance cover everything even if I have something done in Thailand? Can I insure for cancer treatments too (just in case)? I know it's going to cost me but I have the money, although if something is $200 or $1000, then I can easily pay that. If dental work or anything else is cheap enough, then I think I won't need to insure that.

4. Is the air pollution bad? This is the reason I'll rent first and see which parts of the country have better air quality, wherever will wind blow pollution away and not towards me. And can foreigners drive on the road? I heard that foreigners are banned from driving in Vietnam.

5. Is there anything else I should know? I already know about pickpockets, corrupt police, dangerous roads, bad weather, tropical diseases, landmines, Hun Sen, but I am prepared for everything. I've spent watching documentaries about Cambodia for the past two years and so I know the country. Now I'm ready to move!

6. Btw I'm looking at the visa application form and will I have to write down occupation, work place and phone number? I don't work and phone number of a slovenian mobile provider will be useless there (nor will I use it anymore).
What about "point of entry/exit"? That will be Phnom Penh airport, right?
"Address during the visit" - do I write the address of the hotel? Cause I won't know the address until I sign the renting contract.
"Organization, Persons to be visited" - Can I leave this one blank?

7. And one really important thing: which power plugs/wall sockets are used in Cambodia? Where can I buy converters? I'm bringing my laptop with me and I think it's a type E/F hybrid. Otherwise I use type C and F.

Any answer will be appreciated. Thanks!