Oh, wow! Massive ambition from an admitted novice.
Some requirements to consider:
1. Skills in a CAD programme, such as AutoCAD, Rhino, FreeCAD, TurboCAD, or alternatives, some of which are expensive, and others either free or relatively inexpensive.
2. Knowledge of woodworking techniques and processes.
3. Knowledge of the different board materials and solid wood, and their properties.
4. Knowledge and skills in prepping and polishing of wood and wood products.
4. You might need a fairly deep wallet for an appropriate CNC machine able to handle large panels and solid wood. I'd set a minimum budget at perhaps £8,000 - £10,000 for something second-hand capable of handling stuff up to 2440 X 1220 mm. If you went for machines with smaller platens (beds) you'd probably need additional machinery or hand tools to cut standard size panels (mostly 2440 X 1220, and bigger) into smaller parts that would then fit on your smaller platen or bed. You could start your research here:
https://www.scosarg.com/
5. Add to the CNC machine a need for handling the extraction of dust, chips and the like so you'd probably need an extractor and trunking, plus various CNC suited router cutters with different profiles.
6. A workshop of some sort to house the necessary kit.
If all the above seems a bit daunting (it would daunt me, and I've been around this sort of stuff a fair amount) and you're primarily wanting to build maybe a wardrobe or three, perhaps to fit in your house, I think I'd forget about the CNC machinery for now, and build up skills and knowledge by putting something workable together from some board material and maybe some solid wood using a mixture of hand tools, some power tools and may some smaller floor standing machinery. Slainte.