Ok, basic overview of a circular effect

<start radius>=the starting size of the circle
<end radius>=the ending size
<life>=how long it is seen before it disappears
<width>=the thickness of the circle's shell
<red>=how red it is (think RBG colour scale)
<green>=how green it is
<blue>=how blue it is
<alpha>=how visible it is, high alpha=more visibility
<speed>=how fast it moves

I'd say, est_effect (effect) ... but then twice?

Yes, I don't see where else you'd put it in.

To make more than 1 circle, if you mean like so theres several starting same point 1 following another just put es_xdelay .3 then .6 then .9 and repeat the effect lol