Great doc maintained on various reading order preferences here: https://docs.google.com/document/d/11Eual8pX2RqwNcA2f4WuwjiNxRA5CGG61VzlaWqzGNI
For Succession Wars I’d suggest starting with the Gray Markets Anthology. It doesn’t hold your hand and tell you everything that’s going on, but you will tacitly gain information from these stories that will help in later books. Plus they’re all just great stories.