Venosis

I would love to play this game but I want to know the exact steps required to have it fully functionnal. I've done some research online but it seems I'm unable to find the same step by step everywhere. I also heard there is now a standalone version which differs from the mod version but which one should I choose ? Please guys can you help me with this ? ( a simple step by step like 1st purchase this 2nd install this etc ...) I will greatly appreciate your help :)