As DM, I do not consider that my job is to kill you - it's to create challenges for you to overcome in a way that makes a great story. Death is a risk, sometimes a strong risk, especially if you are doing something stupid (YMMV on what constitutes stupid, of course). Without that risk, however, there is no story worth telling. I know people get very attached to their characters (at least, I get very attached to my characters) but it's a dangerous world and sometimes the dice just don't go your way. That said, there's absolutely no fun in a TPK.
I'm currently running another PbP on these boards; I took it over after the original DM left. For those interested in my DMing style, it begins here.
In terms of maps, I was originally firmly against, partly since I do most of my posting from my phone (except at weekends), but also because I have traditionally preferred that old standby known as "Theatre of the Mind". However, my recent experience of DMing PbP has shown me that some sort of map really is indispensable; I will therefore do my best to provide them, with the understanding that I can only update them from my computer which will slow things down slightly.
I generally play by RAW (or RAI if RAW is blatantly stupid); but everyone should bear in mind that the Unchained rules are new to us all. I will get it wrong; you will get it wrong; we will all get it wrong. Please offer and accept correction graciously. Depending on seriousness, we will either retcon any errors or play on with the understanding that in future the rule will be properly followed.