I just finished and made off with one bar of gold.

With that done I'm looking to explore the rest of the area, and find the codes so I can leave.
Anyone have a link for to find them? I've checked youtube and probably using the wrong keywords or something. Usually I'd find it myself but this area is just so dark and feels like a maze and makes my head spin. Everything looks the same and ghost people don't help it.
(Seriously I tried asking direction and all it did was throw a spear at me!)

I have all the ammo/steady codes from the police station and the ones from the medic clinic, I also have the mentats, Demo charges, HD bearclaw, and holo reinforced parts.

I'm looking for the rest of the chem codes and holo mods specifically. Any help with these would be great. I've tried the the Vault wiki but its very vague for such a confusing area.

Links or step by step instructions would be helpful. Please be discrptive if you can. Thank you.

Here: http://fallout.wikia.com/wiki/Sierra_Madre_vending_machine

I found the building for the calibration mod but can only see one way up and its by using a door to get to the roofs. Sas its on the roof, can only see a way by a door....sigh. The doors says to Ruined building...

I'm sorry I can't be a big help, but English is not my native language and I find it hard to describe routes to take to find certain items.
However maybe this will help a bit; I usually just explore/scavenge anywhere possible, the biggest help for me is using the local map
on my pipboy, which shows me exactly which parts I haven't explored yet. Also the wiki sections probably have detailed instructions
on how to find them all. Good luck!

Edit: Also, if you are on PC: I also tend to use the "tcl" command to go to the needed location and work my way back from there to figure out the route.

Youtube has easy to follow videos on everything DM which I used for said purpose of getting everything DM had to offer, except a couple skill books one of which can't be had at all according to the wiki.