The general ethinicity of China is 99% Han Chinese however in Xinjiang there were muslim minorities.
Mao viewed his new role as leader as ensuring 'mass line'. This is continual debate of idealogical policy.
Zhou Enlai became Chairman of the state council or Prime Minister.
Peng Deuhai was Chairman of the National Defence Council or defence minister.
The standing comittee was a select group of Politburo who undertook key descions
The CCP had total control over the military and government from local level to the top. This meant the party could manipulate these to it's favour.
The party congress that met theoretically bought a democratic element to the consituition however it met infrequently. The congress from 1949 did not meet again until 1956.
Mao was prepared to be tolerant of other parties providing they didn't threaten the CCP.
Parties like the Chinese Democratic League and Pesants/ Workers parties still exist today but were targeted during the purge of 1950s and 1960s.
Politburo member Gao Gang was Provincial govenor in Manchuria and had military command in the same area. He was illterate but his good organisation during the Civil war saw him promoted to Head of Central Planning Commission in 1952.
Deng Xiaoping had political and military control in the southwest and had been a long time ally of Mao. He had also worked to consolidate government power in Tibet.