If you can draw a good likeness of yourself using a mirror, then some human “blueprints” showing basic proportions plus a mirror should be enough. Otherwise, take some photos. As JA12 said, position the camera as far from yourself as possible (you’ll need a helper to actually take the shots, the camera should be that far away), think opposites ends of a gymnasium… And a good telephoto lens, so you can actually see your features at that distance.
Perspective distortion is a bugger.
Anyway, JA12 mentioned the uncanny valley. That’s when a model is so good it doesn’t look like a cartoon, but not good enough to look real. Models in the uncanny valley generally give people the creeps, and they don’t know why. You might want to consider using a cartoon caricature of yourself, rather than a realistic model, for your v-blog.
Anyway, you can do a decent caricature using poly by poly modeling to a reference drawing. For a realistic model, you’ll probably want to learn sculpt and then retopologize the sculpture.
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