Our mistake was not to plan the floor space properly, you need to a have a good flow and prevent your staff to run up and down all day to get things done. We have opened 5 months ago and because planning wasn't right we have been moving things around every week! (bean to bar www.cocoafair.com )
Have a lot of multiple electric points so you can move your tools around easily. Check your machine electrical consumption and invest in a proper electrical board otherwise you will have to add on a lot with huge costs.
have 2 big sink for washing and an air compressor for drying your moulds.
Buy a continuos tempering machine (Fbm boscolo, Selmi etc) with dedicated belt for coatings.
don't try save on the tempering, you will waste a huge amount of hours by tempting to temper with machines that are cheaper.
have a small "shop window" it will help you make money.
Hope it helps!