You should talk about the training of doctors from Roman period to middle ages, in a nutshell.
For example, in the Roman period there was no organisation for doctors to set up their own businesses, yet in the middle ages (13th century) towns would allow practice's if the doctor could prove their years of education.
In terms of structure, part a should have 3 solid and well explained paragraphs to get around 9 marks
For part b, aim to write around between 4-5 paragraphs that are well developed and explained in detail. If you have time include a conclusion
Any more questions?! Don't hesitate to ask.