Just picked up the game. Looking forward to see how this mess ends....I'm actually a fan of Lightning.
Any tips (non spoilers) for beginners?
Well...
Abuse Chronostasis if you are someone that worries about time.
Yeah, pretty much. As someone who was really concerned about the time limit (so much so that I didn't get the game), it's really not been that bad. Enemies generally give enough EP so you'll be able to use chronostasis a lot (Chronostasis = freezes time for a short while; it's not long, but it's enough; this is different from "Overclock" which freezes time only in battle). A lot of the time, you won't even want to use it because you need more time to pass to continue missions and such. When you progress a story mission to the point where it asks you to wait until night time or whatever, don't just fast forward. Either do sidequests in that area while waiting or leave it and progress the main story in other areas (just make sure you come back to the first area at night time).
If you are concerned about the time limit still, I would recommend using a guide
such as this one. I don't normally use guides on my first playthrough, but I am with this game... well, at least somewhat. When I find a sidequest, I'll consult the very handy maps that guide has or if the main quest is too vague on what I need to do, I'll look at the maps as well (on the page, looks for texts that say "Map of the Next Tasks" or whatever). I don't read the text all that often on that site, but the maps have been truly invaluable since some of the quests don't offer much help in the way of where to go or what to do. If the game had no time limit, I wouldn't use a guide, but oh well.
Also, I'd recommend doing most sidequests you run across - the npcs will have stars above their head if they have a quest for you to do. They give gil, sometimes garbs, and upgrade your stats. The Canvas of Prayers quests (Chocolina is in charge of them) are not quite as important. They give minimal gil, stat increases, and adornments usually, but there's no reason to avoid them doing if you have the materials/items they require.