Souls veteran here. I suppose i'll share some wisdom that will probably help newbies.
A good reason not to start with a caster build is that for some odd reason in Dark Souls 2, they decided to have spell damage stop scaling in regards to points in intelligence between 20-30. It's very jarring, and depend on where you are and how well you can manage, you might have some problems. Otherwise, caster builds have been rather nice in the past for the most part, even if you still have to branch into melee.
Don't underestimate adaptability - it just doesn't increase the invulnerable frames when rolling, it also boosts your ability to use items. More agility = the sooner you can gain the boon from said item. It can mean the difference between survival and death. As mentioned earlier, 20 adaptability is pretty good, though depending on your style you might want more.
Your stamina recovers more slowly when you have your shield up. Learn to not have it up all the time, and only raise it to block attacks when you see them coming or you are at full. That was the primary issue I've seen in the PvP video with all those people getting their guards broken. Having more adaptability - and thus agility, also enable you to raise your shield faster to guard (Even after a swing) - and - if memory serves, also lower your shield faster to counterattack.
If you deplete your stamina while running, you will be unable to run until your stamina fully regenerates. Try not to ever let your bar hit zero when running away or chasing.
Don't spread your points too thin. Avoid very scattered builds. You will only end up being sub-par or bad in everything. Stats tend to soft cap at 40, so don't plan on going over that unless you REALLY want to qualify for something specific.
Always keep a spare weapon that you can fall back on in case your main one breaks - in fact, having a spare weapon or two is often pretty good.
Depending on your patience, equipping the regeneration ring between fights or when low on health can really help you survive or last longer without using items or estus to heal. Just be sure to remove it when you're ready to march on as the thing breaks easily.
To powerstance two weapons, you need about 1.5x the requirements for each weapon in your stats. Something requires 10 strength? You will need 15 to powerstance a pair. (I think this is the right ratio. Correct me if I'm wrong.)
Upgrading your equipment has a huge impact on it's performance. More than leveling your stats will. You know that fire longsword you can find? That thing is borderline broken if you upgrade it as much as you can straight away - hell, I might even say that the longsword is one of the best overall early weapons in the game barring the mace. Never underestimate what upgraded gear can do.
Spears and Halberds and a few other weapons have some 'sweet spots' - and by sweet spots I mean if you don't hit enemies with the right part of the weapon, you're not going to be doing much. It's an interesting change from the previous titles and does take some getting used to.
The most 'newbie friendly' builds for PvE tend to include some faith investment for healing. You don't need much attunement or faith for some of the early healing spells, so those can be a huge boon if you don't have to invest too much in faith.
Afraid of advancing or don't know what lies ahead? White soapstone. That can help you familiarize yourself with the area ahead, help you prepare for a boss by learning it's patterns, or perhaps even show you something you never knew about. AS an added bonus, successfully completing a white soapstone task is the equivalent of both a human effigy and resting at a bonfire AND you get an added item depending on the stone. If you fail, your resources used while helping are still spent.
Weapons have a lot of variety in their movesets. You can link attacks out of a run, a roll, and a backstep. Most people don't even seem to know of these moves, and they can be incredibly useful.
There are also many differences between Dark Souls 2 and Dark Souls 1. I am guessing it might be a little jarring going from one to the other, but so far my preference is Dark Souls 1 - if only because I liked the overall lore and world more than Dark Souls 2. Probably. It's something difficult to put into words. It had a different director, and though the game is similar, the difference can be felt.