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Some workshops are going on throughout Pakistan by Naveed Anwar from AIT namely "Performance Based Design of Tall Structures" They provide Hands-on training. Recently in April 2018 workshop was conducted in NEDUET. I think it recently occurred in NUST as well in October 2018. I would recommend you to attend this workshop whenever it is going to held in future for detailed information

Please read Statics and Dynamics OR structural analysis by RC Hibbeler.

Yes, it is possible. The clear spacing between rebars should be as per guidelines of rebar-placement in columns. In order for rebars to transfer the tensile forces to concrete, they should have the development length with respect to the top of beam/slab on both sides, above and below.

I never use the default load combinations, I enter them manually.

This is a very loaded topic, it needs a lot of study. These are some of the documents: ASCE-41-13; FEMA P-58_Volume1_508 Seismic Performance assessment of buildings; PEER-ATC-72-1_Modelling and acceptance criteria for the seismic design of tall buildings; NIST GCR 10-917-5 Nonlinear Structural analysis for seismic design; NISTIR 7766 Evaluation of contemporary design of reinforced concrete. I am not aware of any tutorials on this one.