1997 Toyota Corolla different color in fluids!

Normal for a little rust when you are dealing with cast iron. Best approach is to drain system, then use garden hose and flush until you see clear water out lower hose.

Flush it all out and fill with 50/50 mix, flush PS pump and fill with PS fluid. Sounds like you already did :).

Also change trans filter and fluid every 2 years, check CV boots every oil change and axle seals for leaks.
Change oil and filter every 3-5000 miles.
Change fuel filter/air filter every 1-2 years.

I must congratulate you on performing preventative maint. Good Job!