Have you first tried the official guide?
https://aws.amazon.com/premiumsupport/knowledge-center/ses-set-up-connect-smtp/
I sometimes fail at reading manuals; I tried to configure it myself first, but in the end, I relied on the doc for some steps. I suppose it would have been easier if I had stuck to the manual instead of trying to figure out things by myself.
That said, since I actually didn’t read the manual from A to Z, I don’t know if there are a bit obscure parts in it.