I think you must first understudy some international journals in the field of innovative teaching or fields closer to it. This would broaden your knowledge on the 'construct' of the entire marvelous project you have envisioned which I think would serve many researchers especially in education as well as universities globally.
Also, think of appointing very qualified human force to man the international journal who can work at a close to perfection task (Editors, reviewers, copy editors, communicators etc.). Aside from their high qualifications, look for those who are dedicated and are not 'loaded' or sucked in too many engagements so that they would get enough time to attend to the Herculean task of publishing.
A good web designer could help make the website user-friendly and appealing. This would traffic many researchers to the site. Also, there should be skilled communicators who can keep up promptly with clients or scholars who seek for clarifications and queries.
More importantly, there should be strong alliances with highly patronized online databases especially those of renowned universities globally and/or universities that are 'education' program driven. These would publicize the papers published on the Journal's website.
The building of a brand especially for Journals takes a great deal of hard work, time and patience. I have seen Journals that have made giant inroads in just two years. I know with your dedication and that of your team, you would attain this feat.
All the best and thank you for envisioning a great task that would broaden the frontiers of knowledge.