E Texas ex driver 40 years experience retired last 6 years

I retired in 2015 and had 2 heart attacks the same year. I let my cdl lapse but now would like to go back to work. I have 40 years experience and 3.5 million safe miles. Need a refresher to get my CDL back and go to work OTR. Retired after last 13 years with Crete Carrier.