I have non idea of the plan to design a site, I know C# and .NET and now i want to develop an allumni site for the college and i see that "yetanotherforum.net" is the best open source forum compatable for .NET environment( as I want to include forum in the site).I want to develop the site on windows not on linux and the security purposes will be taken care.Now what i want to know is how to start developing the site ,what should be my next step .The work till now what i have done is

1.I know what all should my site contain, i gathered all the information about this by observindg various allumnus sites

Now please help me to proceed in a good site development.