That's the point, it doesn't matter which one to try first, not really sure what's so complicated about it... and to be completely honest, I don't think this chart is only for people who don't know what they're doing yet... I've been club racing for 6+ years and I continue to learn new things all the time. I've yet to master this chart but I have learned a few key adjustments I like to make, but will almost always come back to this chart to double check that I'm doing the right thing.
Before I even touch this chart, I will always select a pro drivers setup that matches my track conditions first, then use the chart to make minor adjustments if the setup isn't exactly right for my track.
Club Racer: SCT + eBuggy + Spec Slash + 17.5T Buggy + GT8e + USGT + VTA + 17.5T TC
Basher: Monster Trucks + Crawlers + Drifters + Motorcycles