If you really need a manual reset trig, you should use an appropriate module (the FSR 1U seems to be convenient). Other methods would be less suitable and could bring you latency.
Concerning the cables, different colors will help you to visualize your patch more easily. And several lengths can be adapted to the in/out distances. However, the longer cables allow you to free up space to access the modules. Personally I prefer this solution and have mainly 100cm cables (Black Market in various colors).
The right angle patch cables can also free up space at the top: this is useful for the passage of hands to the knobs; they are also handy for the live performance cases, those with two boxes that close on top of each other.
Stackables seem a good solution 'a priori'... but they add obstacles for the passage of hands because they stack up high (and they are expensive). 1-in/5-out splitter hubs or 2-out splitters are more practical (and cheaper).
https://www.sweetwater.com/black-market-monomult/series
https://polarnoise.com/product/eurorack-patch-cables-splitter/
You can start with a mix and then expand your cable set. So, again, same advice here: go slowly.
Modular is like wine, an art of living, it must be tasted and enjoyed in small sips :))
'On ne devrait jamais quitter Montauban' (Fernand Naudin).