Maye,

Forget about clipping out with the other foot completely. The other foot will always be clipped in until you are off the bike. So whether you do right or left is up to you (I recommend left, then you can use your dominant foot - the right - to be your standing-on-pedal balance and kick off leg). While you practice this, do NOT think of clipping or unclipping at all. Think of the motion

Slow,

Stand (on right)

Step out (on left.)

Practice with a flat pedal until you get the hang of slowing, standing, stepping.

Slow, Stand, Step out.

Repeat.

Once you graduate from flat pedal to clipless, you can clip back in after you sit back down on your saddle. That motion will be

Push off / Pedal, standing on downstroke.

Sit, resting unclipped foot on pedal.

Pedal one or three revolutions with the one foot still unclipped, to get you going...

Clip in.

p.s. I learned this method here. I'm not sure who taught it to me... Oak?