Your journal wouldn't ever be considered prestigious or even moderately average if you're re-publishing old articles instead of publishing actual novel research.
You could create a newsletter that's useful to some, but if anyone would consider to publish their new research findings in your journal, then that would be bad for them since it wouldn't be considered anywhere equal to a "proper" publication (since you openly claim to accept non-novel findings as well) and would also prevent them from ever publishing it in any "better" journal since that would not be unpublished research any more.
In practice new good journals are generally started by (sub)communities who know each other and feel that [a topic of] their discipline is not adequately covered by the existing journals. This means that since day 1 they have (a) a source of good new papers that they will want to send there and not elsewhere - the whole reason for them founding the journal, (b) a pool of respected and knowledgeable editors/reviewers (the same community), and (c) initial interest of the community who would all read (and cite) the journal. Given that, the only missing part is recognition by various indexes and funding agencies, which will arrive within a few years (3-5?) if the new journal is well run, productive and gets appropriate citations outside of it.
You could create a newsletter that's useful to some, but if anyone would consider to publish their new research findings in your journal, then that would be bad for them since it wouldn't be considered anywhere equal to a "proper" publication (since you openly claim to accept non-novel findings as well) and would also prevent them from ever publishing it in any "better" journal since that would not be unpublished research any more.
In practice new good journals are generally started by (sub)communities who know each other and feel that [a topic of] their discipline is not adequately covered by the existing journals. This means that since day 1 they have (a) a source of good new papers that they will want to send there and not elsewhere - the whole reason for them founding the journal, (b) a pool of respected and knowledgeable editors/reviewers (the same community), and (c) initial interest of the community who would all read (and cite) the journal. Given that, the only missing part is recognition by various indexes and funding agencies, which will arrive within a few years (3-5?) if the new journal is well run, productive and gets appropriate citations outside of it.