Active job

Custom wall shelving for a teenage boys bedroom

We have recently purchased a house in Patumohoe & my teenage son has a lego collection that needs to be displayed. We want to have a custom wall shelving unit built for it and his entertainment electronics i.e. tv, xbox & playstation etc. I am not sure where to start, have pictures of what we had in the past, be good to be able to work with someone to design, build & install. etc.