If more than one person is going to interact with OJS -- think authors, reviewers, etc. -- then you'll have to install it on a server. You'll likely have to either choose a host to provide and manage the server for you (there are many out there) or you'll have to find someone with those skills.
Since OJS is intended to run on a server, it's unconventional to run it on a personal computer, and it'll take the same skills to set it up there.
Public Knowledge Project Team