rocket question

I accidently posted this in the wrong group (was looking at one group
thinking i was looking at another) so I'll repost it here:

Its my understanding that you need a 3 stage rocket to get to orbit. How
small can a rocket be and still be able to accomplish inserting a small
object (say, a 1 pound object for arguments sake) into earth orbit.
Do all orbits eventually decay? Or is there some magic sped/alt where it
becomes a permanent orbit?
Thanks
Eric
.

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