Planetary Industry (PI) is undoubtedly an interesting source of semi-passive ISK, as it requires a relatively low level of skill points (approximately 20 days of training for a basic start). Therefore, after the initial setup, you'll begin to have a small boost to your finances. Here are some tips and tricks that I hope will help you make the most of it.
The Epithal is the best asset you can have for your PI setup since it comes with a dedicated hangar for the materials you'll extract, as well as another hangar for your command centers. Additionally, it's an economical ship that requires a low amount of skill to use.
When installing your Command Centers, you don't need to go directly to each planet. You only need to have this item in your ship's hangar, be in the solar system where the planet you're going to use is located, open the PI menu, and you're ready to install the Command Center while safely docked at the station.
To set up material extraction cycles, you can do it from any solar system. You'll only need to go to the Planetary Customs Office (POCO) to extract the final material or transport it to another planet as needed.
In the latest change to materials obtained from planetary industry, I find the use of crates in extraction and/or production schemes inefficient. A launchpad can perform that function without the limitation of transfer times, optimizing your production.
If you don't want to complicate your PI too much, you can focus on extracting only P1 materials, which have a low price but also a low time requirement to set up.
If you want a bit more ISK without going into very advanced materials, I recommend producing all the materials needed to manufacture fuel blocks, as these have a high demand and their price usually doesn't decrease much.
Make the most of your account's Omega status and train these skills for all three characters you can have.
I hope this helps you generate some extra income to achieve your goals in the game.
Fly Safe o7