Skill Discussions

My preference would be the two range skills followed by DPS skills. I wouldn't worry about T2 launchers until you have all the other skills to 4.

LOL!!

My preference is the Damage skills first,
Missile Launcher Operation, Rapid Launch and Warhead Upgrades.
Then the other support skills at an even pace. All to 3, all to 4 etc.
In any case skills to 3 and 4 go very fast.
I would recomend them all to 4 and then get the T2 launchers.
Next would be the 'fast' support skills to 5.

So 3 different posts with 3 different views.
Clearly each poster has a good reason behind their approach.
I don't know if my way is right, but also, they are not wrong.

These two are only necessary if you are shooting missiles at targets smaller/faster than the missiles are designed for. For Guided Missile Precision, check the explosion radius of the missile versus the signature radius of the target: if the explosion radius is 50 and the target radius is 75, GMP is not going to help. For Target Navigation Prediction, compare the target's velocity to the missile's explosion velocity. Note that you can reduce the target's speed using a webifier, and you can increase the target's signature radius using a target painter.

As for deciding which order to train skills in to maximise DPS, that gets pretty easy since you already have exactly one dimension you care about. Look at all the skills and how they directly impact missile DPS or indirectly impact DPS through modules they grant access to: for example Weapon Upgrades 4 gives you access to T2 ballistic control systems.

Now to prioritise your training plan, divide the DPS increase by the time taken to train a skill. You'll end up looking at units such as 0.7% per day (change in DPS divided by change in time, aka ∆DPS/∆T). Just work through the list based on descending magnitude of ∆DPS/ΔT. This will maximise the DPS gains for each skill you train.

A simpler though less optimal heuristic is to simply train the shortest skill first.

My priority would be the "secondary skills" listed above: Rapid Launch, Missile Launcher Operation, Light Missiles, Warhead Upgrades. Add Weapon Upgrades 4 into the list since that specific level of that skill opens up T2 ballistic controls. Once you have access to the T2 skills (X specialisation), put them into your list in the same way: figure out how much more DPS you will get (2% per level when using T2 launchers) and divide that by the time it takes to train.

That's my priority list;

1. Missile Launcher Operation
2. Missile Projection
3. Missile Bombardment
4. Rapid Launch
5. Target Navigation Prediction
6. Warhead Upgrades
7. Light Missiles

Using the MDPD (Max Dings Per Day - shortest training times first) with the exception of Light Missiles which training above 3 seems like a waste of time IMO. Unless you want to use T2 missiles for some strange reasons.

EDIT:
Once you get all those skills to reasonable levels (3-4, depending on what you are currently doing), you should focus on ship supporting skills that decrease usage and/or increase raw PG/CPU of your ship (Engineering, Electronics, Weapon Upgrades, Advanced Weapon Upgrades). Having Cap skills also helps (Energy Systems Operation, Energy Management) and since you will probably fly Caldari ships all the Shield support skills (Shield Operation, Shield Management are the 2 core skills and Tactical Shield Manipulation and Shield Upgrades being the Second most important shield skills, then there are of course also Compensation skills).

On the other hand you could train to get all the Battlecruiser and Destroyer racials before the skill split takes place instead.

Don't forget about training weapon upgrades to at least 3. Weapon upgrades gives you a 5% reduction per skill level in the CPU needs of weapon turrets, launchers and smartbombs. It's under gunnery, but it's more important in fitting missile using ships as you often run low on cpu.

Advanced weapon upgrades you can likely hold off on until you start having a lot of trouble with power grid, and it's worth bringing weapon upgrades to 5 in order to reduce the power draw of your launchers to be able to fit shield stuff. This generally thought of as a gunnery skill as it's more important for guns, but it can often make the difference between a perfect fit or having to fit a reactor.

Especially as a noob, you should start with low-hanging fruit. You say your Warhead Upgrades is only at 2, so training that to 3 will take about a day or so. Do that ASAP. Serioulsy. After that, look in the game-interface for more low-hanging fruit.

Weapon Upgrades and Advanced Weapon Upgrades are both good to train for a noob, although AWU shouldn't be trained above 4 early on.

This is almost always a good core principle of EVE skill training.