Chummer is a huge help for character building.
https://github.com/chummer5a/chummer5aHuman Samurai pretty well writes itself, Resources A, Stats B, Skills C, Metatype D, Magic E. Max out quickness, 5 Reaction and Intuition, spread out the rest. Gun skill, Sneaking and Perception are your basic skills. Wired 2, Used Reaction Enhacers 3, Smartgun link, Data Jack, Muscle Toner are your basic 'ware choices. Still leaves you lots for customization.
Pistol Adept isn't much more complex. Stats A, Metatype B, Skills C, Magic D, Resources E is a fairly common start. Stats and skills start out the same, instead of 'ware take Improved Reflexes 2, Combat Sense of lots, splash of something else. Qualities take a Mentor Spirit.
Lots of build examples floating around on the forums. If you're looking for feedback post a build, or search around there are many examples floating around.
Edit: Max out Agility, not quickness. Too many game systems...