If you're gonna start writing about time travel and want to include novelverse stuff, you definitely want to start by reading the two Department of Temporal Investigations
novels, Watching the Clock
and Forgotten History
(written by our own Christopher
). They take every time travel episode and movie and build a set of plausible rules around them. Although it's mainly set in the 24th century and focusses on the DTI agents Dulmur and Lucsley (from DS9's "Trials and Tribble-ations"), we get to meet temporal agents from the 29th and 31st centuries too. We also finally meet Future Guy from Star Trek: Enterprise
Although it contains complete spoilers, a quick glance at this page
shows how much research and thought went into these books, taking both real-world science and Trekverse pseudoscience into account.