There are 2 basic types of handguns to consider: The Revolver and the SemiAuto Pistol. Both the revolver and the semi-auto pistol have their strengths and weaknesses and you must decide which one will best suit your needs and experience level.
Semi-Autos
Pros
Cons
Fast to reload
Chance of jamming
Higher capacity
Slide might be hard to work
Tends to be thinner
Tends to be lighter
Can be less expensive
Revolvers
Pros
Cons
Easy to maintain
No magazines
Easy to inspect
Slower to reload
No magazines
Limited capacity
Can sometimes shoot different calibers
Tends to be wider
Lager Calibers Available
Usually more expensive
Harder Trigger Pull
Heavier