Maximus wrote:1. At what point in a fight do you decide to berserk? I tend to wait until I am less than 30% of my HP because I'm trying to avoid eating my perma-food if I can, but sometimes my berserk ends before the fight ends or I get hit by a great mace during my berserk and die anyway.
Either berserk immediately before you hit melee range, or not at all. If you have a reasonable concern that berserk will end before the fight concludes or that you will get lethally damaged even while berserk, you should be running away. Berserk gives a multiplier to hit points and a damage bonus, so every hit you give or take before you activate berserk lowers the benefit you get from that berserk.
You should not worry about food at all. There is ample food in the game for all the berserking you might need to do. Don't activate it for fights that you can easily win without it, but activate it without any hesitation if it will guarantee a victory in an otherwise risky fight. Also use Trog's Hand and Brothers in Arms without hesitation if the situation calls for it. Trog piety gains quick and spends quick, and it's normal to be bouncing up and down over the course of a few levels.
Maximum wrote:2. How reluctant should I be to switch weapon types, especially once I get a decent amount of exp into Axes? Enchanted axes seem to be quite rare in the early game. Lots of short swords and maces though.
If you find something that is clearly better than what you have, then it is a good idea to switch. Berserkers only have a few skills that are useful, so a little wasted xp isn't as big a deal as it would be for some other builds. Swapping from your starting hand axe to a sabre is probably not worthwhile, but a whip of electrocution definitely is.
And really, you should care less about getting an enchanted axe and more about getting a BIG axe. Battleaxes are pretty common, and even war or broad axes are going to be better than your hand axe. If you see a bigger axe that's +0/+0 and unbranded, you probably still want it.
Maximus wrote:3. Poisoning is pretty painful early on. So much so that I try to avoid fighting adders and other monsters with poison if I can. Should I put some exp into Throwing early on? At 0, darts and rocks don't seem to be very effective at all.
Adders are pretty much the most dangerous thing that routinely spawns on D1. They are a good time to pull out your berserk. Once you have a couple levels under your belt, poison stops being much of a concern because you have a big pad of hit points and probably some potions of curing as backup. Anyway, the best way to deal with a poisonous monster is to kill it as quickly as possible, and the best way to kill things as quickly as possible with a berserker is to put all your xp into your weapon skill. Darts sometimes help on the approach, but you shouldn't expect them to reliably kill things. They're for softening things up a bit on turns that you weren't doing anything useful anyway. Weapon skill will let you attack faster, getting more chances to hit, and it also provides an accuracy bonus, which makes those hits more likely to actually count.