The first and foremost thing is obviously to arrange an idol of Lord Vishwakarma for the puja. Depending on your spending capacity you can even go for a very small sized idol. In the extreme case you can also do with an image or even just a reverence in your mind.You must also get a priest on time. In the last moment it might not be possible to get the priest.
The priest will tell you all that you will need to do the puja. Just arrange for these before the puja.Ensure that not even a single thing is missed and you know exactly where you have kept what. You must ensure that you clean the factory well before the puja begins. The place where the idol of Lord Vishwakarma is placed must be washed well before you place the idol. The machines should also be maintained well before the puja begins. Some belive that buying a new machine on the day of the Vishwakarma puja can actually bring in good luck and prosperity. As per the wish and ability of the owner the factory can be decorated. Some owners many also invite a friends and family for the puja.