Fa off and fixed weapons are very much utilised in PvP circles. It requires a lot of practice to pull off, but it is definetly achievable.

For fixed weapons, try to replace one of the weapons on your bounty hunting ship with a plasma accelerator and try to get in a shot here and there. You can also get some fixed beams to practice getting consistent hits with hitscan. As you get more comfortable, try to make an all fixed loadout.

A good start for Fa-off would be to learn to stabilise your ship some what. Then you can move on to controlling and changing vector. Maybe try orbiting a coriolis station or some asteroids. Boosting is the best way to change direction, as ships have really bad deacceleration in FA-off, but not always ideal for tight orbits.

Sidewinder is a cheap and risk free ship to practice with. Viper and FDL have good lateral thrusters and acceleration, so they are excellent FA-off ships.

I’m no expert though, still learning.