You can travel in Veliky Novgorod by bus or trolleybus.
Bus schedule (in Russian)
You can get to the Novgorod Kremlin from the central railway and bus station on buses № 4, 7, 7а, 8а, 9, 20, 101 (bus stop is marked with arrows on the scheme).
You can get to the Vitoslavlitsy Wooden Architecture Museum from the central railway and bus station on buses № 7, 7A (bus stop is marked with arrows on the scheme).