Radagast was probably wandering about near his house, but we do know that he was instrumental in sending Gwaihir to Isengard, which meant that without him, Gandalf wouldn't have escaped, and the Fellowship wouldn't have gotten where it was.
I don't think Gandalf really had a plan for Mordor. He seems to be the type that would get there first, scout out the situation, send Aragorn and Legolas ahead as scouts, and then make a decision based on what they reported back, or something like that.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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