You need a AM3+ socket Motherboard that will support that processor.
This Asus Motherboard supports your FX 9590 and is the LAST newest version for this particular model:
TUF SABERTOOTH 990FX R3.0 | Motherboards | ASUS USA
I have the same motherboard for my FX8350 but R2.0 and it has been excellent Motherboard and purchase. I have had it for over 5 years without any issues at all plus it is made with military spec components to make it last.
But most if not all AM3+ Motherboards are now considered to be End of Line or Legacy and not supported with driver updates.
If you don't like this Motherboard than google AM3+ Motherboards and you should get a list of different manufacturer Motherboards.
But before your buy a motherboard, go to the Motherboard's Support page and look at its CPU SUPPORT LIST. Make sure your FX9590 is listed.
Like the Asus I linked above: TUF SABERTOOTH 990FX R3.0 CPU Support | Motherboards | ASUS USA
The above is a partial list of the full CPU Support page.
This Asus Motherboard also supports the FX9590: CROSSHAIR V FORMULA-Z CPU Support | Motherboards | ASUS USA
