Get a 3D digital model made of your home. This will be an extra cost but it’s vital that you understand the layout of your new home. The cost is well worth it if you’re struggling with how to read a floor plan.
If you’re working with a design professional they will probably be creating a 3D model at some stage, probably during detailed design. See if your architect can provide you with a 3D model earlier in the design phase if you need it.
Or you could commission a 3D model from another source, here's a suggestion - but I haven't used them personally. Not all 3D models are created equal. Expect to pay around $200 for a full model (including roof - which I recommend so you can understand the full form of your new home) QA Graphics
Another option is to check out Realar. Realar is an augmented reality app. It’s pretty cool. You can walkthrough your floor plans as if you’re taking a video with your smartphone.
Create a physical 3D model
Architects sometimes make physical 3D models for their projects. If this is something you'd be interested in, ask your architect. You might also be able to find an architectural model maker in your area.
If getting a 3D model made from your house plans is going to come at an extra cost it's well worth it if you’re struggling with how to read a floor plan. It's really important that you understand the layout of your future home other wise you won't really know what you're paying to build and you might get a shock when you do see your new home built!
Mark it out in real size
If you’d like to get a sense of your new home in real life size you have a couple of options:
Mark out the floor plan on a 1 to 1 scale (the real size of the rooms) outside with some tape or strings and tent pegs on the ground.
If you want to imagine what a particular space is like see if there is a space in your current home that’s about the same size and imagine it being the space in your new home.