DaisyI said:Yes, it will grow well in sandy soil but remember to keep it watered.
All avocados are Persea americana. You won't know the variety until it matures and bears fruit (at least 10 years from now). But, you may not know than if this is a seed grown tree as seeds don't come true to the parent.
Yes, full sun. Choose the planting location wisely - avocado trees can easily grow to over 50 ft. tall and wide.