Where can I read the new regulations?

The regulations related to TRID are codified in 12 CFR Part 1026 - Truth in Lending (Regulation Z). The CFPB has a link at http://www.consumerfinance.gov/eregulations/1026-1/2015-18239#1026-1 Another site which many have found useful is https://www.bankersonline.com/regulations/12-1026-000.

In particular, the following sections are particularly useful in understanding forms completion:
12 CFR 1026.37 - Content of disclosures for certain mortgage transactions (Loan Estimate)
12 CFR 1026.38 - Content of disclosures for certain mortgage transactions (Closing Disclosure)
 
Other sections which contain significant guidance are the following:
12 CFR 1026.2 - Definitions and rules of construction
12 CFR 1026.3 - Exempt transactions
12 CFR 1026.17 - General disclosure requirements
12 CFR 1026.19 - Certain mortgage and variable rate transactions
12 CFR 1026 Appendix D - Multiple Advance Construction Loans
12 CFR 1026 Appendix H - Closed-End Model Forms and Clauses