293lbs and 50 years old, interested in Emscuplt. How many sessions?

At your current weight, you will need more sessions to have improvement. You might consider liposuction of the abdomen first to decrease some of the excess fat. Or, start your weight loss journey now. Intermittent fasting can be very helpful for many people.

Before committing money and non-surgical treatment that had very low impact I suggest you look carefully at honest before and after pictures of what these treatments can do and people your age at your weight with your skin quality.
Should you be successful in losing 100 pounds you will most likely have severe skin laxity and will need skin surgery.
Even mild skin laxity or excess subcutaneous fat will hide any potential results from a muscle strengthening treatment like what do you propose.
Changes in your underlying muscle structure simply will not be visible through thick layers of subcutaneous fat and even slight skin laxity.
There are only few patients who really benefit from this treatment.
They are generally young people with a very low BMI who have tight skin in which case you can see muscle definition.
If you can’t see muscle definition now then you will not be able to see muscle definition and the treatment does only muscle strengthening.
Before wasting lots of money on treatments that will not deliver any visible results I suggest you have a few in person consultations with local board-certified plastic surgeons.
At your current weight you are not a good candidate for cosmetic surgery. The first step is successful weight loss.
That doesn’t mean you can’t have consultations and get an assessment and better understanding of various treatment options especially after successful weight loss.
I’m afraid your proposed plan is most likely going to lead to a major disappointment at a fairly substantial financial cost.
Best,
Mats Hagstrom MD