Us and found the hypervascular nodule (0.9x 0.8mm) and the nodule was hypoechoic. they found also mildly prominent submandibular lymph nodes bilaterally. on the left the node measures 5mm and on the right the node measures 6 mm. what does that mean?

Further investigation is warranted here even though the nodule is small. A solitary thyroid nodule in a male and the hypervascularity are concerning for malignancy. The enlarged submandibular lymph nodes may or may not be related and would be more concerning if they were only on the same side as the nodule. I recommend consulting both a thyroidologist and a head and neck surgeon for best advice.