
..use the modpack: Just hit the button 'Install this Modpack' and follow the instrucktions.
..use the serverpack: Download the serverpack and unzip the zip-archive. Now browse the exracted folder to find the bat-file 'MCMM_Server_Start' and run it. After that the server should do the rest for you.
The server's default ram is set to 3GB. You can change it by editing the bat-file.
You should use Java-8 to run this modpack.
If you have problems with fps drops make sure your Minecraft has enough ram and remove the client side mods BetterFoliage, OptiFine and disable shaders, if you have one in use.