A bit to Simplified. and somewhat inaccurate. Let's see.
Ranges: Close(less then 10km), Short(10km-1000km), Mid(1000km-.5Ls), Long(.5Ls-10Ls), Extended(10Ls+)
Mount: Secondary(a Ships Secondary Araments. smaller, cheaper then Primary, but a bit weaker), Primary(a Ships Primary Weapons), Fixed(anything Attached to something that isn't moving, weather a Space station, a Planet, or in a free floating Orbit(I.E. Mine).
Kenetic Weapons: rocks, Mass Drivers, handguns. these Weapons Deal Damage by pure Kinetic force.
-Advantage: Simple, Small, Cheap.
-Disadvantage: Energy Cosumptive, Easy to Dodge at mid-long range(unless they don't know it's coming).
Missiles: a Rock With a Drive. these Weapons rely on warheads to deal damage instead of kenetic force. while not as powerful as Kentics, the fact that they can alter there course means they are much more likely to hit at Longer range.
-Advantage: Low Space Usage, Acurate At Long Range.
-Disadvantages: Limited speed, can be shot down, Limited Supply.
Beam Weapons: your Standard energy Weapon, Beam Weapons are the Standard weapons of your typical SiFi Starship.
-Advantage: Unlimited shots, easy to hit with.
-Disadvantage: Weak, Energy Consumptive.
Par tical Weapons: THEE Weapons you want when Going head to head at Close Range. From Plasma Cannons, to Ion disrupters. but at Longer ranges, these weapons thend to suffer problems from dispersion.
-Advantage: Suicidal to Engage at Close range, heavy damage at short.
-Disadvantage: no damage at Long Range, Limiter Damage and Midium range, Energy Consumptive.
Fighter Craft: Fighter Craft are Separate, smaller ships who hitch a Ride on their Interstellar Counterparts. while they Lack their own Star Drives, they Excel in maneuverability and can be very hard to hit.
-Advantage: Excellent at All Ranges,
-Disadvantage: Large, Limited Supply, Expensive.
Gravitational: Weapons that Cause Damage due to Gravitational Sheering Forces.
-Advantage: Hard to Stop, Large Area of Effect, Powerful.
-Disadvantage: High tech Requirement, Expensive, dangers to User, Very Massive
Dimensional: weapons that Break or at least Severely bend the Rules of Reality.
-Advantage: VERY POWERFUL
-Disadvantage: Uber-Expensive, VERY high Tech Lvls, Dangerous to Use.
No I know these Categories don't cover every Weapon, but they can cover Almost any we can think of when Combined. Ex: Beam+Missile=X-ray Warhead, Beam+Dimensional=Wave Motion Cannon, Kenetic+Missile=Inirtial Warhead.
Fightercraft will have to be combined with another weapon, Unless you want them to be just manned missiles.
Gravitational weapons should be limited, and Dimensional Weapons should be Outright banned, because they would Serious Unbalance the Game.
now On To Defensive means.
This, is a Bit Simpler. it can be put into 3 categories. Point Defense, shields, and Armor.
Point Defense is basically shooting down a weapon before it can hurt you. it is quite efective Vs. Missiles and Fighter Craft, it's not so efective Vs. any other Weapons.
Sheilds: Your Basic All Around Defense. There is no Piticular Weapon it is weak or strong at, but it Is an All or nothing Defense. If they are brought down, you will be forced to fall back on your other defenses until they can be brought back into play.
Armor: the Primary Defensive Measure. Be it Abaltive, Chermtric, or just Plain Steal, Armor simply Shrugs off the blows Directed at it and absorbs the damage delt to it. But the amount Damage a Certain area can deal with is limited, and unlike Sheilds, once the armor is gone, it's going to remain gone until repairs can be made.
Power systems, engines, drives, and sensors should be pretty much Standard. they would take up a set amount of space, but improvements in technology would increase their performance and decrease their size, opening up more slots to by used for defense and weapons. the Number os SLots a weapon required would vary among them, being determined by the weapon type, and weather it was a primary or a secondary weapon system. defensive systems would be one slot each.
There certainly won't do you any good on a planetary body.
