I don't give advice about how to play, so all of this is my opinion, and nothing more...
1) If you use weapons of different speed (nomads and skyblast for example), then the one your eyes see easier is the one you're going to aim with, and this may render your other gun(s) less useful (in either case you're going to hit with one type or the other, not both at the same time, unless they are heading straight for you, or standing still).
2) The sabre's advantage over the other VHF's is its front facing turret, If you're facing an eagle, its shields are what you want to get down asap, and so you should stick a shield killing gun on the turret (rapier turret lvl
, if you're facing a Titan, then you want to get its hull down faster, so stick on a salamanca turret -lvl 9 (fires same speed as nomad weapons - unless you know something that does more hull damage at the same speed?).
3) Nomad weapons do the highest amount of damage per second, above ALL of the other level 10 guns in the game. Unless you want some pretty effects, dump any other lvl10 weapons.
4) Missiles, torpedos and mines can be used very effectively against most players, but if your target is expecting them to be used, then they can be very easy to dodge/evade too.
5) But the most important aspect is - knowing your ship and its limitations, knowing your target, and its strengths & weaknesses.
And since you're in a sabre, don't run in circles with an eagle, unless you are trying to deceive them with another tactic.