Class and tips.

 In Guts and Blackpowder endless mode, you can use one of the 7 classes available: Line Infantry, Officer, Seaman, Musician, Sapper, Surgeon, and Chaplain/Priest. However, not every class is suitable for endless. The best classes for endless are either Officer or Sapper, why? Officer has the charge ability that will give grab immunity for its duration, while Sapper can build defenses (Officer is more recommended). Lets assume its Officer used because most people use it. For the sabre, use the thrust (Down arrow) for quick attacks, this is especially useful against runners which will start to spawn in wave 6. Wave 7, there will be a bomber, use the pistol or bait it. When there is a sapper zombie, often abbreviated as Zapper, they swing their axe overhead to attack and deals 2/3 damage of a player full health they have highest health out of every other zombie type, always wearing a uniform which newbies confuse as teammate. Wave 20, Igniter will start to spawn, they doesn't bite, but instead throws a lantern that will set the ground on fire, they predict your character movement then throws the lantern in that direction, after that, they will still attack but with punches. Try to learn window jumping, as the amount of windows in few maps might be useful for you to try and survive later waves, example: La Haye Sainte. 

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You can also buy DB Pistol or Brass Pistol to help you survive the waves when bombers start to spawn.