*Insustry standard for creating and maintaing websites, i think everyone will agree is Adobe(macromedia back in the days) Dreamweaver
*Comercial and personal differences, money, more people visiting the sites, more chances of complaints if somthing dodgey is placed on there.
*Html(learn some basic tags etc), CSS (learn how to just sort the style sheets)
*as above
*Be friendly, general intreview stuff really (im 15 i'm not really prepped for this stuff )
NicP