ANSWER: Pray 1 more rakah and do sujood as sahu after salam and make another set of salam after sujood as sahu. If you did not do that, your prayer is invalid and you must repeat it now. 

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ANSWER: You should dry spit and you can dry spit at your left foot when in congregation when a person is standing to your left.

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ANSWER: You should do sujood as sahu since you sat down and did tashahhud before realising your mistake.  Sujood As Sahu (Prostrations of Forgetfulness)

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ANSWER:  Pray 1 more rakah and do sujood as sahu after salam and make another set of salam after sujood as sahu. If you did not do that, your prayer is invalid and you must repeat it now.

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