go here and check your bmr(the harris benedict audis mentioned)
http://www-users.med.cornell.edu/~sp...lc/beecalc.htm
or here
http://www.bmi-calculator.net/bmr-calculator/
but keep in mind this is just a rought estimate of your basal metabolic rate, i.e the ammount of calories you would need to maintain weight if your bed ridden.
Its a decent guideline. My BMR(bodyweight 210 height 5'11) according to H-R is around 2150 and thats probably higher than my true BMR since I maintain weight at 2300-2700kcal and I cut at 1800kcal.
Your protein requirement is usualy around 1gram/ib of bodyweight. When cutting its good to get like 1,5 or so. So 300 seems good for you.
For the rest of the macros. Be sure to get at a minimum 50 grams of fats and like half of them mono saturated and around 8-10 grams *****'s. Other than just toy around with the ratios and se what suits you.