for problem 1 i never had any of them issues, check with your host that they have the requirements for the script. and for your last question, well if you have to ask that then you really need to read the instructions and learn because that is basic stuff.

http://www.boonex.com/trac/dolphin/wiki/DolphinDocs

I would also say before you try running a website learn how to work with php, html, css, mysql and domains and hosting.