Some info I dug up during the early play tests of CEAW 2.0;
http://en.wikipedia.org/wiki/Russian_Gu ... re_of_WWII
"The program of the partisan war was outlined in the Soviet People's Commissaries Council and Communist Party[1] directives issued on July
29, 1941 and in following documents. Partisan detachments and diversionist groups were to be formed on the German-occupied territories, road and telecommunications disrupted, German personnel killed, and valuable resources destroyed. Stalin, in his radio speech on August 3, 1941, reiterated these commands and directives to the people. Hitler, when referring to that speech on August 16, pointed out that the declared partisan war in the German rear had its advantages, providing the excuse for destroying "anything that opposes the Germans".
The first partisan detachments, consisting of Red Army personnel and local people, and commanded by Red Army officers or local Communist Party activists, were formed in the first days of the war, including the Starasyel'ski detachment of Major Dorodnykh in the Zhabinka district (June 23, 1941)[2], the Pinsk detachment of Vasily Korzh on June 26, 1941[3]. The first awards of the Hero of the Soviet Union order occurred on August 6, 1941 (detachment commanders Pavlovskiy and Bumazhkov."
"Operation Bagration, June 22-August 19, 1944. Belarusian partisans took major part in the Operation Bagration. They were often considered the fifth front (along with the 1st Baltic Front, 1st Belorussian Front, 2nd Belorussian Front and 3rd Belorussian Front). Upwards of 300,000 partisans took part in the operation."
As you can see, Russian partisan activity got going pretty much straight after the invasion and escalated with time, becoming quite sophisticated and well organised. The Red Airforce commenced flying supply air drops sometime in 1942 and these increased over time.