Do i need a trainer if prior broken bone while running.?

No: I suggest that you can get back into running by paying attention to your diet and to how fast you ramp up the intensity and volume. A diet with appropriate calories, protein, and vitamins/minerals (particularly vit. D and calcium) is vital. Regarding intensity and volume, start slowly and increase slowly. You should not add more than 10% of weekly mileage per week. Make sure to rest. Crosstrain.

No trainer: You do not need a trainer just because you had a previous fracture i assume you have fully healed and your motion and strength are fairly normal. If that is so i would suggest twenty minutes every other day as a starting point. If you don't have fairly normal motion and strength s/p your fracture, then you probably need therapy.