Next steps???

Hey guys... We just got some not so great news that my DH has a very low sperm count (600k). Of course we were initially upset, but now that this is our reality, we are ready to get going on what's next and remain hopeful and positive in this new journey God has decided to take us on.
If any one has been in a similar position, I would greatly appreciate/love any words of advice, success stories, or anything really. I'm still in this place of confusion and dealing with what is to come. 
IUI vs IVF? I'm just interested in taking in as much info as possible to make the best decisions moving forward.
Thank you 😘😘