Questions regarding class / job choice

[Sagittarian]

I just started playing FFXIV yesterday

Welcome to Eorzea!

1. Is solo content relevant in any way come endgame and if so, which jobs are generally best at it?

Only for main scenario quests or re-running older content solo for fun. Some of the main scenario instances may be harder to complete as some classes but they are designed to be able to complete with any of them. I have not had any issues with any of them as SMN.

2. Which role (tank, heal, dps) is the most sought after at level 60 (I am thinking about accessibility of dungeons and raids, waiting times and such)?

Generally tank, then heal. Except for the 24 person raids where the role division is 1/2/5 so dps is more in demand.

3. Which jobs are generally the most valuable to a party and which of these are generally the least represented at max level.

That really varies between patches as different classes go through phases of popularity. Also you are encouraged to level multiple classes on your character so most people will have several classes they can play even if they are the same role (tank/heal/dps).

4. Which jobs make it easiest to carry a dungeon party with (provided you are good enough at it)?

I'd say a toss-up between SMN and WAR. WAR has enough self-healing abilities that they can finish a lot of fights solo if done perfectly. SMN is the only non-heal that can raise during combat and has a tank summon.

5. And lastly - which job do you personally enjoy the most and why?

SMN because of the general utility, then AST because of the ability to switch between shields/regen based on the need.