(1) It is better to sit like sitting in tashahhud during khutba, if you feel any difficulty in sitting like it, you can change the side.
(2) If we are in front of imam, we should turn towards him and listen to the khutba attentively and if we are towards right or left side of the imam then it is not unlawful to turn to him. However, it is better to sit facing Qiblah so that the row is not disturbed.
(3 & 4) One should not read it verbally; there is no harm if one reads it in his heart.
Allah (Subhana Wa Ta’ala) knows Best
Darul Uloom Deoband