Sharepoint server 2010 installation

Question

Hi All,

I want to install sharepoint server 2010 in my system.
Can any body tell me Required softwares for installation. i have seen many sites for installation guide,but they are following different procedures, i am not able to understand those guide lines.

1)please tell me step by step process like which one i have to install first,second,third,etc.....

2) I am using windows7 Ultimate OS, should i install windows server 2008?

3)I have downloaded Sharepoint server 2010.exe file from Microsoft. It was 410 MB. is it correct ? other wise give me correct path to download SharePoint server 2010?

Please provide these requirements...
thanks.