Rx-7_Enthusiast

When I start my FD it idles at 2500 rpm for 3 secs then drops down to 1,300-1,400 rpm and stays there for 2 minutes and drops slightly to 1,200 rpm when fully warmed . I shift to first and the cars idle begins going up and down from 900- 1,300 and keeps doing that.*Note* I am still depressing on the clutch so the car isn't moving. Is this Normal? I let off the clutch a little and it slightly starts to stop but doesnt really stop. Also when I start the car it shoots out a lot of white smoke from exhuast which completely goes away after 2-3 mins. Normal? thanks guys! =)