How to start with Astra Militarum

Dear warriors of the Imperium,

First of all, my apologies for yet another message about how to start with Astra Militarum. That being said, do you have any advice on the best way to begin with this army and which lore books are recommended?"

Dear warriors of the Imperium,

First of all, my apologies for yet another message about how to start with Astra Militarum. That being said, do you have any advice on the best way to begin with this army and which lore books are recommended?"