Hi Ken and welcome aboard future Trooper! Have a read in the “Getting Started-Read this First” section, as there is some really good info in there for new members.
Have a read in the "ANH Build Threads" section to discover other troopers who are building (or have built) the same armor as you! Really good tips, examples, pictures, previously answered questions, and successes here.
In addition to looking at all the various build threads, I highly recommend checking out the “Advanced Tactics” section where you can see examples of those who have taken their armor to the next levels of screen accuracy (EIB and Centurion). I’d recommend that you aim to build to one of the certification levels, as TK’s look their best at these levels. It's really not hard to acquire EIB or Centurion, and it’s best to do during your build rather that after.
If, and when, you’re looking for other bits –and-pieces, accessories, boots, blasters, electronics, etc., be sure to check out the “Imperial Commissary/PX” section for items for sale, project runs, and for other stuff that most of the troopers use.
Also, if you haven’t done so already, make contact with your local Garrison. They’ll help guide you through the process of becoming a member of the 501st, and may have local Armor Parties in the works where you can get hands-on build advice and guidance, not to mention meet members of your future Garrison.
So, start a build thread here on FISD; post lots of pictures and questions. We are all here to help you out and to make sure you look your best, and represent the 501st as best as possible.
All the best on your TK journey!