Newbie has questions

[ImNoProgrammer]

I have GoDaddy hosting my domain. The SMF install went smoothly.
Here's where I am stuck.  I used Dreamweaver to create and upload my current web site.
All the SMF files are there (included in my existing site) but I don't know how to customize anything!  This is my first attempt at a forum but I didn't think it would be this confusing.
Any advice would be appreciated.