I completely screwed up with my Fusing orbs and didn't realize that the gems have to be linked for support gems to work. I have a rarity gem and quantity gem that havent been working. At least now I know what I need to do. I just hit level 49 and in third act of Cruel.
Even with 20% mitigation, 47% evade, 75% lightning, 73% cold and 53% fire Its tough. Also Chaos dmg mobs are eating me alive. I am trying to get more Chaos resist.
I am sitting at 690 HP and 390 ES, with about 380 Mana pool. One thing I am confused on is whether to go Armor/Evade/ES blend or Armor/ES or Evade,ES.
Your stats are pretty low across the board. Light/cold res are obv okay, but you really should have all your resists maxed out by the end of normal or early cruel (excluding chaos, which can generally be ignored until Merciless). Your HP/ES is reallllly low, and you are focusing too heavily on ES. My level 36 char is sitting on 1200HP/100ES (the ES isn't really intentional, its just a side effect of some of my gear). Your evade seems decent enough (I think... I rarely go heavy on evasion), but your mitigation is really really low.
The first thing to understand is that there are two dichotomies at work here. HP vs ES, and armor vs evasion. There are a number of mechanics at work, it would be best to find the info on the PoE forums or the wiki, it'll be explained far better there than I could do.
In general though, you should focus on one thing from each of those dichotomies. For a new player I would recommend HP and armor. ES is much less effective than HP until the later levels (60+), and even at that point it requires certain passive nodes and generally more expensive items than an HP based build. Chaos damage is only dangerous for ES based builds that haven't taken the Chaos Innoculation passive yet, and you should never take that until level 60+ and only if you have some really nice gear ready. For HP based builds its not really that bad even without much resist, as chaos damage is generally lower than other types of damage and is much less common.
One very important thing to keep in mind, and I don't think this is explained in game anywhere, is that certain status and elemental effects are affected by your HP pool. What I mean by this is that your chance to be stunned/chilled/frozen/burned/shocked is a function of the amount of damage that attack did and your total HP pool (there is a complicated formula for this, but I'll stick to the basics). The duration (and thus the damage or potential damage of it) are also affected by this formula. To keep it very simple, with a low HP pool (such as what you might have if you went 50% HP / 50% ES), you are much more likely to become afflicted with this statuses, and their durations will be much longer when you are afflicted by them. This is incredibly dangerous, especially in relation to stun/freeze/shock. Think of it like this:
1000 HP character gets hit for 200 damage by a freezing attack - chance to freeze will be 30% and the freeze duration will be 3 seconds
2000 HP character gets hit for 200 damage by the same freezing attack - chance to freeze will be 15% and the freeze duration will be 1.5 seconds
This is not the actual formula. But it illustrates the basic concept. Your ES does not get counted as part of your HP pool for these calculations.
The armor vs evasion decision is more complicated to explain as there are so many factors going in to this decision. Armor is easier to stack though and easier to understand, and is generally considered more effective than evasion, so I recommend you stick with it until you get a better understanding of the game mechanics. Regardless of which one you choose though, its usually more effective to focus heavily on one rather than try to maintain high levels of both, so pick one and really go for it. Keep in mind though that if you choose evasion, you can't completely ignore armor, but if you focus heavily on armor you should be fine with little to no evasion.