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Abaqus bending capacity

Hello, everybody. I am relatively new to ABAQUS so i need help from the ones who know a lot more than me. I did a lateral torsional buckling analysis of a beam made of shell elements and i have introduced the first buckling mode as an initial imperfection for my next step where i need to obtain the ultimate bending moment, which has to be lower than the critical moment, due to imperfections. My questions are:

1) Do i conduct static general or static Riks analysis?

2) Do i use the critical load to obtain the ultimate bending moment?

3) How do i manage to find the moment value in the middle cross section of a beam? I have tried with free body cut, but the moment value and the direction are not what i expect.

If anybody has experience with this type of analysis, i will be grateful for words of advice.

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