I only fly for my Fatherland, never for the Allies
Pick up an Elite-Jasta, such as Jasta 2, Jasta6, Jasta 11, Jasta 18, Jasta 10, Jasta 4.
Jasta 10 never had Triplanes, but with them you can also fly the Pfalz D III, when you are serving in Jagdgeschwader 1.
For the first Time, start your Career in early 1918. Then you will start with the Albatros D V, in most Cases. Albatrosses are good Planes to start with!
You will need some Practice for the Fokker Triplane, but once you get it, you will have a deadly Weapon in the Sky. Fokker D VII is easier to fly, simply the best Plane you can fly on the German Side.
If you are starting in 1916, pick up one Date from October 1916 onwards. Then you will have the Albatros D II in most Cases, which is a good Counterpart to the Nieuports and Sopwith Pups at this Time. The Halberstadt D II is a moderate Plane and you can get some Kills with her, but it's outclassed by some Allied Scouts at this Time. If you are flying Albatrosses in late 1916, you will also have 2 Machineguns, which is a big Advantage against your Allied Opponents.
And last but not least, you will fly mostly over own Territory in your Career. It's a good Way to avoid becoming a POW
Have Fun