Handwriting itself should not matter much. But your personality clues in the handwriting will matter obviously.

For mbbs as a cadet or have you done mbbs already?

Requirements are given with the advertisement, especially on the official website. When applying, check for the required height and see if you fit the criteria.

You can join as a civilian medical student without any issue. Medical fitness is only for uniform personnels.

Rules and policies are same for both amcolians and graduates of other medical colleges.

Number of years to become a specialist depend on many factors. Broad outline is given in the articles.

MBBS in any medical college of Pakistan is of 5 years.

Both have same career opportunities. Legally and policy wise there is no practical discrimination between both types of doctors. Choose the one which suits best with your life.