Hi Mukai92! Welcome aboard!
I'll chime in with what these fine chaps have already said and suggest starting around 1917, preferably in a plane like the Sopwith Pup or SE5. For me 1918 has the better machines, but the pace and the numbers start to strain my situational awareness and that makes it harder to adjust. 1916 machines feel... slow. And I typically am my own worst enemy. I've torn the wings off of my Nieuport more times than I can count.
The Pup and the SE are two of the more stable, easy to fly platforms I've used. The Pup is incredibly docile, hard to lose in a fight, and can out turn just about anything you'll encounter from the Germans after Bloody April. The SE is - despite my handle - my favorite kite of the First World War. The SE can make even a mediocre look good - and I certainly qualify as mediocre! It's easy to turn, dives like a dream, has a nice engine which only improves with the Viper upgrade. It has twin guns to the Pup's one, and it's just an incredibly advance airframe. It feels more like a machine from the 20s than the 10s. The SE is also assigned to typically elite units like 56 or 60, so you'll have hardened veterans around you.
Just my two cents! Hope you are enjoying WOFF immensely! Air Starts also help in cutting down time. But when you have a chance, try a full mission with no time compression. It's like stepping back in time to the real deal - and the immersion is second to none!
Cheers!