The question i have is do I need to watch Voyager as part of the time line .
The timeline of Trek doesn't really matter very much - it's mostly irrelevant - for any
New Trek fans often ask things like "which order should I watch Trek in?", but the writers did not take that question seriously while they were making the shows. The writers put virtually no continuity, or world-shaping events, between most Trek episodes, and even less between series. There might be a few exceptions to that, but not enough to make an important difference in terms of what series to watch, or what order to watch in.
Most of the "references" to other Trek episodes are throwaway one-line minutiae.