I want to become a vegetarian bodybuilder, I'm 27 thus, in order to create a diet, I need your advices!

That's me few days ago.

My current level of activity is very sedentary, I'm a student and I spend most of the day sitting on a chair.
Since Two weeks I've started a very soft lifting programm, three times per week, I spend in the Gym approximately 1 Hour and half each time.
I've used Harris-Benedict formula to calculate my calories exependiture, It's about 1900.44 kcal/day.
My questions are:
1) At your opinion what's my body type?
2) Should I increase my calorie amount in order to gain lean mass (and a small percentage of fat) OR decrease my calorie level and lose fat (and a small quantity of muscles too)?
3) Any general advices?