Q. What's recommended for bonus stats at 60, full vit, full str, or a mix?

This is purely a choice based on how comfortable you are in your role. Most will recommend all your points into STR and then gear your accessories to STR or VIT depending on how much health you feel is necessary for the encounter you're doing. Some prefer the comfort of more VIT, some don't feel it's necessary. As a fledgling WAR, I'd recommend all your attributes into STR and your accessories as VIT. The more comfortable you get, the more you can shed that VIT and get more STR.

Q. What's a good, noob-friendly opener as the MT?
This is the opener I would recommend:

Infuriate -> Tomahawk/Overpower* -> Unchained -> HS -> Maim -> IR + Berserk -> Storm's Eye -> HS -> SS -> BB -> [Fracture] -> IB -> HS -> Maim -> SE

* = Tomahawk is used if you need to move the mob from it's initial position. Overpower is used if you don't. Overpower generates more threat, so it's good to make this distinction when pulling.
[] = If you don't have 450+ Skill Speed, drop Fracture as you won't be able to get your last hit in.

You can also replace SE combo with BB combo and vice versa depending on how comfortable you are starting with a non-enmity combo.

Q. What's a good, noob-friendly opener as the OT?
https://www.youtube.com/watch?v=_CMXI8RuQOY

Easiest to pull off. Unfortunately, when you will do this varies from fight to fight. Bismarck EX, Ravana EX, and Alexander F2 are all fights where this opener isn't optimal, you just need to judge for yourself what you should be using in place of this. Other than those, I'd recommend this opener.

Q. Why is the sky blue?
A clear cloudless day-time sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light. When we look towards the sun at sunset, we see red and orange colors because the blue light has been scattered out and away from the line of sight.

Q. What foods/pots should I use?
Any food that gives you a lot of Crit/Det. You can also use Skill Speed food to fix your 9 hit Berserk problem if you don't have enough already. For pots, you should use HQ X-Potion of Strength - if you can afford it, Draconian Potion of Strength is better.