Ok because not much people really understand it.
For the Client, you have to go to here
and sign up for this site. Then go to click download:
After you downloaded it, you have to move the files move the womclient to where you want it.
Then you have to download the link that is in the readme.txt and move that one into the lib folder.
Then you run minecraft.exe, fill in your account information and type Opticraft Dev Server in the server list, save the url and go build some awesome things!