Power Steering Fluid Question: Mixing ATF + PS FLUID?

[stallion]

Ok xcuse me for being a complete noob/idiot.

What color is P/S Fluid? And ATF Fluid? The fluid in the resevoir is clear at the time. If I were to extract it all out with a baster, what should I fill it with (which fluid is the best? Lucas? Any recommendations on the best thing to fill your p/s resevoir with?) Should I be concerned with the mixing of the 'clear' and the 'new' fluid I will be putting in? Any hazards? Or should I just flush the entire system of its fluids and fill it up with my 'new' fluid? I know mixing motor oil won't be too harmful but wasn't too sure how mixing fluids will affect steering and such... Especially if there's p/s fluid and you're adding ATF. Anything will help. Thanks!