Welcome to the room Max, you're sure to get a long list of suggestions here.
One bloke will tell you to get a McTavish custom job, another will tell you to get a SUP, another will tell you to get a Clearwater, I'll tell you to go see the guys at Diverse...... Oh, and one bloke will tell you to get a giant epoxy tuflite by Mickey Munoz....
Truthfully, for your weight you want a longish board, 9 feet plus, that has some volume, as in about 3 inches thick. Some makers are now making on volume, and will show litres capacity on their specs, so anything above 80 litres will float you OK. Make sure it's not too heavy of you're just learning, then get some quality lessons.
Most importantly don't listen to Mac, Lacey, Chrispy or OBCT, because they'll just tell you to buy what ever looks good under your arm.....

EDIT - see, my first prediction was correct