I've taken a peek at your development thread and such, though please consider this rather informal, of course, and just advice for now.
First of all, as you probably know, the Palemaster PrC falls under the multi-step CDQ category of PrCs. This means that it would be two or more CDQs, or a WLDQ. You should be aware, there's been a precedent that the earliest people are generally approved to start on the CDQ path for a PrC is about one level before they qualify for it mechanically. I think you already qualify for the PrC mechanically, so balance the expectation that it will take more than one CDQ (and there is a 2 month waiting period between CDQs) with when you think you want to take it, and plan accordingly.
When you think you're ready to start on the first CDQ to Palemaster, you should post an updated biography (this is a short description of what's happened to your character since creation that has led them to that point) along with the request in the Character Submission forum, and someone will review it and any of your development then.
Informally, your CDT shows lots of support for an inclination to head toward palemaster already. What I am slightly more concerned about is that it leans pretty heavily evil. Watch this--you have to keep playing your TN alignment until you apply and are approved to shift toward evil, so you need to stick firmly in morally grey territory until then. Best limit the cackling, gleeful contemplation of "testing" out nasty spells on innocent bystanders, in other words.
The other part that jumped out at me was this:
The man identified himself as a powerful merchant, with connections all over Mistone and Dregar. Wealthy and powerful. He had a proposition for Githrin.. Join him as his assistant.
The idea was intriguing to Githrin. He knew he needed an ally, someone to help him continue his research into the deathless arts.. and here might be the man to do so.
But there would be cost.. possible death not being the least of them. It was made very clear to him that should he accept the offer, failure would probably mean the end of him..
Githrin shrugged, had he failed before, he wouldn't have been standing in front of the man having this conversation in the first place...
The man gave him a week to think it over, and an address. Within the week, if he was interested, he was to present himself to the address with nothing but the clothes on his back and what he could carry in a sack...
Was this to do with a quest or GM interaction, or just something you invented? While there's no rule against writing NPCs and using them in your CDT, you can't use them to get around requirements for PrCs and such or to just write yourself a bunch of powerful allies. We prefer that people not just write receiving offers of training from powerful wizards/mages etc, invitations to join secret guilds, organization, etc. This is the stuff of CDQs. This has to do partially with balance--in a GM-run quest or situation, the GM is monitoring the risk and challenge to your character, and when you write it yourself, there's no real risk. As an extreme example, someone could write "I met a dragon and they taught me draconic". They might write it in beautiful detail, but that wouldn't be allowed because dealing with a powerful dragon would be something that would have to be controlled and mediated by a GM. This is the same principle as not writing encounters for existing NPCs that were not controlled by a GM at the time. For example, you can't walk up to the captain of the guard and write both sides of a conversation you imagined them having in your CDT, because the NPC's actions and responses should be determined by a GM.
Of course on the other extreme, it's rather silly to assume that the only people your character runs into are other PCs, so it's fine to colour up your CDT with interesting descriptions of commoners and villagers or even guards or other adventurers ... just all within reason. If it isn't something you are very certain your character would have encountered or seen at one point (like a starving child, having a villager scream and run from a monstrous race, watching guards training and wishing he were one of them, remarking on all those studious wizards in the Spellgard library, etc. etc.) then you should be very careful. If you're uncertain whether it would be okay or not, it never hurts to check first before posting.
Anyway, I hope that information helps. In summary, keep up the CDT but just keep an eye on the content and you should be in good shape for when you're ready to apply. After that, it's CDQ time, and whether or not you can take the PrC depends on the outcomes of the CDQs. One other thing you might do to prepare at this point is try to attend a GM quest or two if you can make one, or read through the CDQ threads and figure out what GMs have a style you like and can run your CDQ, so you know who you want to ask when the time comes.
Let us know if you have any more questions!