You can simply merge this resource pack with all other resource packs.
It should not overwrite any old files and just be plug and play with your current server resource pack.
You can use the sound codes in any plugin that can define custom sounds from a resource pack or simply play them using the default Minecraft command, example:
/minecraft:playsound dwarfpack1:esron.dwarf.welcome voice [USERNAME]
This individual sounds you hear in the resource pack are done by a professional voice actor, I (Esron/Fred) own the full commercial rights to sell this product.
You are allowed to use this pack on your server, in singleplayer or any other way you please, you are not allowed to pick it apart and re-sell or distribute the sounds.