Could some BGLO ladies please explain how the NPHC sorority rush process happens?

Can some ladies please explain how BGLO sorority rush happens?

Suppose, hypothetically that I was a young lady in freshman year with good grades, etc. and I wanted to rush the NPHC sororities, and I don't know anything about Alpha Kappa Alpha, Sigma Gamma Rho, Zeta Phi Beta or Delta Sigma Theta? (Assume that all 4 groups are on campus) What is the process please? Do you check out all of them, so as to make an informed decision, or is it best just to approach only one (even if you don't know anyone in that one sorority, or in any of the other BGLO sororities).

I would like to expand my knowledge of both the NPC and the NPHC systems, and any helpful, informative posts would be appreciated. Thank you!