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That's the only reason the first kill matters for not getting many. Otherwise you want something good to get courage. On a similar note, if you want to do a ultra DON'T BE A TROLL!!! You will not get to level 45 at all, ever.

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Don't worry about changing align. CN or C is same difference at this point. You are still chaotic. Now you have 3 things that can happen:
You find a lawful altar. In this case I'd convert to L. Do this by saccing 1 gp at a time till you hit L.
You find a neutral altar. I would convert altar to C, by saccing a neutral monster. Remove good worn equipment, and risk is pretty small for negative effect. If altar doesn't change, sac another one. N monsters are most "human" monsters (barbarian, assassin, cutpurse, bandit NOT berserker), ratlings, and most regular animals (blink dogs are lawful, at least hell hounds and dire wolves are evil). After altar is C you can sac away. If YOU turn to N, well its not that much of a problem either.
If you find a C altar, no problem.
If you do not find stomofillia in UD you will most likely not be crowned until you can buy ratling food from CoC, because trolls need too much food. And when you sac you dont generate corpses.

First kill is not a big deal, as long as you write down what you get. Rat/giant rat might be a bad idea, but goblin, kobold, goblin rockthrower, large bat are all good enough. If you want ultra you should easily survive ID:up to 100.

Ultra with Troll are a pain. You will have to use a wish for monsters to kill for exp. Emperor moloch, or ancient karmic wyrms while seriously slowed. It can be done, but this is an advanced player trick.

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Precrowning: Possible if "your level" is equal or more thsn 3 times "number of artifacts generated" + 8.
0 artifacts generated: You can precrown at level 8
1 a.g.: P.c. at level 11
2 a.g.: P.C. at level 14

Of course each precrown generates an artifact, and remember that pyramid is closed at level 17.
Si before dwarftown. And killing black druid generates artifact, entering gremlin cave generates, entering underground of dwarven graveyard generates artifact, doing pyramid generates 2, entering darkforge generates artifact.

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if my info is correct TH gives you somtehing like 100 extra items from killing 1000 monsters. most of this food and gold. what are you chances to get smthing worth? and the cost of three talents.

i'd prefer killing extra thousand of gremlins in dh. that is sort of reliable.

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Well now it's your turn. What info is that and where can I read it? I am really curious about this because I haven't seen an accurate description of TH. I would imagine that the easiest way to program the talent would be to reduce the %chance_of_nodrop (if there is such a variable). But then again I don't know how the drop formula is either. It is very creature dependant in addition a standard Danger-level vs. Item drop percentage algorithm. So when you say 10%more drops, and more gold and food, that would make the talent much less valuable than I thought it was. 10% more drops is not very much, finding 11 in stead of 10 wands - and probably it was just another door creation...

I would also like to see some research on how uch corpse generation is affected by food preservation skill level and items of hunting.

Not code-hacking, but research

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please notice i haven't said 10 p[rocent extra items. if you are killing something with very low drop chance increase might be over 100 and it is believed to be 0 procent increase for ancient dragons.