I just begin to play this game after almost 12 years (Broodslayer PW got so much of me) , I'm playing the second and third campaign (The one from expansion) but I can't remember which skills are useless for the first one (though playing that is for nostalgia because... ewwwww).

I mean, the ride skills are from the special modules, but can't remember if the Craft skills were on the first NWN1 alone or until the expansions appeared.

A quick test would be to bash a few doors and see if components come out of them. If they do, then you can craft. I remember using Craft Trap to great effect, but I can't remember what module that was with. I think HotU and SoU used them, but I can't remember 100%.

You need to pass a DC 13 with the Craft Weapon skill check to craft a bone wand from a dropped large bone in both the OC and SoU that doesn't provide any of the magic crafting constituents. That's the only crafting skill that matters but only if you also select Craft Wand feat to use it.

HotU provides all the components needed for Scribe Scroll, Craft Wand and Brew Potion feats so the Craft Weapon skill is no longer needed.

None of Craft skills need training (just enough INT and luck in the roll), but if you want to craft some mundane weapons or armor, they will drop from bashing or killing certain creatures (like some constructs) with the assortment very lean. CC is probably your best bet if you dig that sort of thing.

The bluff and intimidate skills were also added in HotU, so don't bother investing in them if you're playing one of the other official campaigns.

anything added after the OC has no purpose in it. you can use the craft armour skill to modify your armour's appearance, but beyond that I don't believe you can do much. as was mentioned, it's possible to craft bone wands, but you cannot actually use a skill or feat to turn them into a magical wand as far as I recall. edit: or maybe you can, but the OC wasn't designed with that XP loss in mind remember. but I guess you can.

check the wiki. look for a line at the bottom that says "added in SoU or HotU". that means it won't work. and by won't work I mean there's nothing in the script to use it on. the manual makes no mention of it as I had thought previously. you'll just know the ones that aren't usable by their absence from it, but obviously that's more trouble than just checking the wiki.

that said, spells do work. some spells, like the bigby's, the OC wasn't balanced to handle, so they make some things a little more bearable. I find they don't work against dragons and also they failed a few times on other large things so I guess there might have been some balancing. but generally they work fairly well. so stuff like that. but you have to keep an eye on it.

double edit:

also appraise does work though. they patched that one in. your int modifier will contribute to the merchant check regardless of whether you have the expansions, and so will appraise, if you have any ranks in it. that one does work.

All in a nutshell. Well, tables anyway.

Craft Wand absolutely works in the OC. Experience is so easily amassed in the OC for arcanists who have a HUGE ECL advantage anyway, crafting a few wands just for giggles will hardly dampen the leveling potential.

In SoU, hides that drop can be used for crafting some mundane armors with that skill.

Parry is about as worthless as any skill. Avoid that one as it ties up an otherwise useful combat mode option like PA or Expertise.

Intimidate (as mentioned) has no value in any campaign that doesn't offer epic levels (like the OC). But it alters the DC for Terrifying Rage so becomes important in barbarian-focused builds in the SoU/HotU series.

I defer to you, I'm not an expert. ah tumble works, too. quite well.

Thank you very much.

Having a reasonably high crafting skill in very early OC can be useful, as crafting weapons and armor is quite a bit cheaper than purchasing. Beside OC, some modules where shops and money is rare, make even more use of crafting, but that's not the question.

The skill points are better spent elsewhere anyway.