First of all congrats!! Buy Turtle Black Box to protect your black car, I have black city too and this product is the best. Wash your car with a good shampoo and always use micro fiber cloth. Avoid polishing/waxing even washing your car in direct sunlight. Rest do not use ordinary cloths for washing, if you can manage buy a micro fiber sponge, i bought it from Saca motors lahore for 450 rs.
Just keep one thing in mind black needs extra care. Rest you are fine, best of luck