You should really find someone at your school/hospital who does ophthalmology research to be a mentor. That's not to say they need to plan your study for you, but they can provide 3 critical services:
1) A mentor can tell you if the problem is interesting or not. Usually, that's the job of the PI/last author, but seeing as you don't really have one I'd be very worried whether the project you've chosen covers a problem (and is structured and executed in such a way) that is of relevance to the field. It's not as clear-cut as it sounds. Sometimes (most times?) people end up replicating results, do not go deep enough into a question, or use questionable methods that render the conclusion (and all your hard work) meaningless.
2) A mentor can read your manuscript and help edit from the perspective of a reviewer. If you don't get some serious input from someone knowledgeable before you submit your manuscript, you are going to get rejected. Scientific peers who review your manuscript during the publishing process are there to challenge the validity of your paper, not to be editors, and a manuscript in need of editing will be rejected despite wonderful ideas.
3) A mentor knows the literature and knows what journals are the best fit for submitting your manuscript. They also know people in the field. As part of the submission process, you usually have to provide a list of people who you think would make good reviewers for your particular paper, people whom the journal will contact and ask to review your manuscript. If you don't know anyone, you're going to be left scratching your head, and the journal is not going to find you very credible.
A mentor can also explain the publication process in more detail to you. Basically, you have to decide where to submit your manuscript, look up the format guidelines for that journal and make sure your manuscript is in adherence. Manuscripts basically follow a formula of
Introduction/Background
Methods
Results
Discussion/Conclusion
References
The manuscript draft is usually double-spaced, with 1" margins, 12 point font, with figures included at the end. Tags are used to indicate in the draft where figures go (e.g., [INSERT FIGURE 1 HERE]). There are a lot of other little details, you should google it or pick up an APA style book.
Once you have a manuscript, and you've edited it about 100 times or so, you'll submit to a journal. These days that can usually be done online, but it's possible that you may have to mail something in. Again, consult the journal that you're applying to.
Once the journal has your manuscript, they will enlist several people to review your manuscript. This can take a while, and you will not be able to submit your manuscript to other journals while it is in review - it is a serial process, one journal at a time. One of three results are possible:
1) Rejection. It happens, usually outright, but it can rarely occur after #2 below if people feel that you're not making progress.
2) Reviewer critiques. If the journal editors and reviewers feel that there is some merit to your study, but that it is lacking somehow, you will end up with a list of reviewer comments that you must address. So here you go back to the drawing board, trying to make the reviewers happy. Usually you have a deadline to complete changes. Resubmit your updated manuscript, this time with a separate document that addresses, point by point, each reviewer comment and how you addressed it (or why you didn't address it). You can disagree with a reviewer comment, but you had better have a good reason.
Almost every published paper goes through option #2. Further, once you send in your revised document, you can get a list of new critiques that you must then address in the same way.
3) Accepted. Very, very rarely happens without #2, usually only so if the work is just so damned important that it can't wait. If you struggle through #2, you should get here eventually. Just sit back and wait for the proofs to arrive. Go over the proofs carefully and identify any errors, cause that's the last time you have to really correct embarrassing typos.
IRB stuff should all happen before the research starts, and is the responsibility of yourself and whatever physician you are working with to get straight. If you're dealing with and/or seeing any sort of patient personal information (names, birthdates, SSNs) you will likely need IRB approval and human subjects training certification. In the manuscript you may write something like "This research was conducted under the approval of our IRB," but that's as far as it will go on the publication side of things.