Steps for creating a scientific journal

I have organized several times some international conferences on my field (computational chemistry), where accepted proceedings are afterwards evaluated again for it submission to a special issue of a journal. Now I am thinking that I could create a journal for all those submission, even if at the beginning we have no impact factor (ISI) or if people are not so interested, but I would like this idea very much.

So I wonder of you can point which steps should I follow for creating a journal. I think I could attract many submissions, and I have servers where I could host it, but do not know the other technical and/or legal details.