Disclaimer - In order to venture into endgame with a combat ranger, you need optimum gearing to be viable. Whereas other classes can maintain range and kite, we are forced to engage in melee with enemies that hit like trucks. If you are not at max damage reduction and dodge, high missle reflect and as much HP as you can muster, you will die often and gruesomely. I would even go so far as to suggest farming up tier 1 with a ranged character, enchanting/gemming it, and then starting endgame with your ranger.
15 Thousand Cuts
15 Sweeping Strikes
15 Blade Dancing
15 Slashing Wounds
15 Nature's Blessing
15 Gift of Renewal
1 or 15 Bramble Wall
10 or 15 Bladeweaving
These are the skills I always take. Bramble Wall is our only reliable nature counter builder, I generally take 15 in it for the 20% damage increase, but if you have mana constraints, 1 point will still get you the necessary counters. Blade weaving is our escape spell, although you must be careful to stop auto-attacking before using it as it does not function like berzerkers shadow burst (and pass through enemies). Often I have attempted to disengage from a boss, only to bladeweave INTO him, not knock him back, but stay in place as he continued to hit me. I tend to take 10 points for the bonus armor and lower mana cost, but 15 points grants some helpful regen while disengaging and a more spammable repositioning option. And although Slashing Wounds isn't the largest dps increase, the immobilization resistance is huge and will save you from being frozen while enemies attack your flanks.
Depending on how many points you put in Bramble Wall and Bladeweaving will depend how many points you have left over (34 to 15 points). I usually put 15 points into Precision for added damage, and 5 points in Rites of the Moon for an ally that distracts enemies, has knockback from thorns, casts bombardment to increase DPS and heals with Gift of Renewal. However I urge people to find what fits with thier playstyle. Just be wary of having to many skills with cast times, as being stuck in casting animation instead of autoattacking can kill you.
Ideally, your gearing should focus on just one thing, survival. Since we cannot equip a shield, and our skills restrict us to dual wield with a sword in our offhand, we are best suited in gear with parry. Once again I suggest to accumulate a set of residual/reactive aftermath from DF with a ranged character. Reactive is preferable, but requires a character than can do challenge chests. Once you have your set of gear, I would enchant it first with damage reduction to hit the 75% max in DF (taking into account the extra 15% DR that Nature's Blessing gives when fully charged). The rest of the enchants I would use for Health, to get it around the 30k range in DF. As for gemming, your first concern is Missle Reflection from Solider's Folly gems. I would suggest 3, to bring your missle reflect in DF to around 80%. Calypso's Curse gems will increase you dodge, so attempt to get it near 75% in DF. The rest of the gem slots are up to you, I went primarily with str gems to increase damage and hit 500% crit damage. Be aware that we burn through mana extremely fast, so a reactive aftermath amulet with high mana on hit is important. (or the 10 piece residual bonus)
For weapons, I highly suggest the Residual Aftermath Axe with the Reactive Aftermath Sword. The 2-4% life steal on the residual axe offers huge benefits for leeching. For thier gems, I suggest Jaha's Last chance, as 450 life per hit is huge.
This you will have to figure out on your own, but there are a few tips I have learned. As previously stated, make sure you stop auto-attacking before using bladeweaving if you actually want to disengage. Always charge up your bramble counters before engaging, its a pain but the added HP and DR will save you. You will end up spamming bramble wall and closure on every cooldown to maintain thier buffs, and since thier cooldowns are similar you can get into a nice rhythm. Always precast spells that have a cast time before the fight if possible (eg. Rites of the Moon), because you gain no leech while in casting animation and this can kill you. And realize that although this game is balanced around elite difficulty, as a solely melee class, you will die (lots). I still get 1 shotted by missles I never see and I dont manage to reflect. If my AoE dps from closure is not enough to kill adds, they build up and eventually I will die. But its still an amazing class to play (once you are geared properly).