Ok, if you don't know how to unpack *.tar.gz files then you need to grab a linux book and read a bit about linux. Looks like you are diving into linux and expecting to install applications already. Take it slow. There are lots of info out there on the web. Look on the web on how to install Mysql, Php, and Apache. Once you are stuck, then post here. I'll help you with the *.tar.gz.
tar -zxvf <file>.tar.gz
I would suggest man tar to see what those flags mean.