Use circuit board template in your design process to ensure easy consecutive designing.
FR4 is by far the most popular set of PCB substrate materials. Here is how FR4 dielectric constant and your material properties will affect your next PCB.
Not only do you need the best PCB design tools that you can get, you need schematic capture and design tools with the most up to date Gerber PCB software. You need Altium Designer.
Make sure your high voltage PCB design is safe and manufacturable with the complete set of design tools in Altium Designer.
You can make the transition from being a hobby PCB maker to a professional designer when you use the best PCB design tools in Altium Designer.