Many ways to skin a cat! A lot will depend on your equipment. Can you cut square, accurate, chip-free panels? Highly unlikely on a table saw.
Do you have a way of quickly and accurately drilling line bore holes? Generally this means drilling multiple holes per stroke.
How are you going to join the case parts? With the proper equipment doweling is fastest. Lots of other simple ways, biscuit, Domino, screws, blind dado, Confirmats ....
Material choices: Melamine board is the most common. Pretty consistent thickness, durable finish, many colors/patterns BUT heavy. The two most commonly used thicknesses are 5/8" (16mm) and 3/4" (19mm). Prefinished plywood is used by people with an aversion to P Bd or MDF. In some markets melamine on MDF is common. There are considerable variations in the quality of melamine panels. The face papers can be anywhere from 40 gram to 120 gram, thermally fused or glued.
Most common back is 1/4" let into a groove and secured with hot melt or staples while held square in the case clamp. If you don't case clamp take care to keep the case square. The nailer goes behind the back. Some people use plant on 1/2" backs, no nailer. Look over all the options. The full European system has been very well worked out. Hanging rails, leg levelers, hardware etc.
Whatever system you opt for, accuracy is key to a good result. Hafele has lots of hardware, some tools.
We are a commercial only shop so everything is Euro box construction.
If you have specific questions I'll try to help. There is an out of date Blum publication that might be a good starting point. See if your supplier has one. Might be able to find it on-line.