Here's a small but growing collection of articles I've written on the subject of making models.
Particularly useful tools
Tamiya spray primers
Designing and making etched metal parts
Cleaning, preparing, and painting 3D-printed parts
Cutting 3D-printed sprues and runners
The 3Dsf.info Tinkercad Review (including tips)
Injection moulding for model makers
How did you paint your Millennium Falcon? A model maker’s survey