Nope, nothing like a resurrection is featured (yet at least).
What difficulty level? While abusing the AI is possible even on harder difficulties, I'd recommend playing on the easy if you're new to UFO:AI.
Tips:
Use cover a lot. Always try to end your turn out of sight. (Very important for survival)
At the very least when the alien armour becomes common, forget and get rid of the starter secondaries.
First, get lasers ASAP. After that you can research things like autopsies for some time but when the alien armour comes up, research it and then the human nanocomposite armour ASAP.
Inaccuracy in longer ranges is sometimes compensated by huge amount of bullets (machinegun). Rocket launcher is decent for long range but actual explosive support should be done by the grenade launcher. Flamethrower is the best at its range.
And, most importantly, until this is fixed,
DO NOT RELY ON REACTION FIRE! It's very unreliable right now, so don't build your strategy around it (
this topic, second page for more info).