But I just decided to try to make a system in T5 and gave up.
Are you trying to build an entire planetary system? If so, ask yourself a few questions.
1. Am I going to use all of the planets in the planetary system, or is the action primarily taking place on one planet?
2. If the answer is the action is primarily going to take place on one planet, then build that planet first, based on what you visualize the characteristics to be. Do you have a picture in your mind of the planet?
3. Is the primary planet going to be readily habitable by humans, or will it require an artificial environment?
4. Do you need a gas giant in the system? If so, add one, and worry about placing it properly later.
5. Do you have to know the exact type of the star, or is that something that is basically, the Sun is yellow and like Sol?
Basically, break your task into blocks, and build things as you need them. One thing that has helped me figure out the rules a bit better, is break the various chapters and sections covering World Building into separate files, and start with the basics of the primary world. I generally will have an imagine in my mind as to what the planet should look like, and then go from there.
Do you have a specific plot or story line in mind that will take place on the planet? Analyze why you are building the system. What are your objectives? Get answers to those questions, and building a system becomes easier.
The text needs to be unpacked severely.
I'm not dumb. T5 is just painful to comprehend. The more I hear about it or see what other people are doing... I want to look at it, I really do.
Part of the problem is that Marc put everything including the kitchen sink in the rules for building a planetary system rather than using a series of building blocks.
Edit Note: It would also help if Marc could decide whether the Hydrographics percentage is based on Flux + Size, page 431, or Flux + Atmosphere, page 433, rules T5.0.9.
Personally, I go with 2D-7 + Atmosphere, unless I decide that I do not like the die roll, and set it to what I want. Remember, die rolls are advisory, not written on plates of stone.