How do I make an IMDb page for my own animated series?

Jordan: The way to submit a new title, such as a TV series, to the database is by submitting the forms that start at https://contribute.imdb.com/updates/edit?update=title and continue on succeeding screens. Please note that you may be required to provide a Miscellaneous Link as evidence of your series (i.e. a URL proving that your series will be or has been shown or made available to the public to watch). 

The key thing that IMDb will need before allowing this series into the database is evidence that it will actually be shown and made available to the public to watch. Note that it would not have to be shown on regular television; distribution on YouTube, for example, would be accepted. If you are doing this project basically all on your own, you might need to wait until the first episode is actually released before IMDb will accept the series. On the other hand, if this were a project for which you had a commercial distributor and which was written about in media articles, it could be listed in IMDb before being released.

While the new titles form may look difficult if you have never used it before, it gets much easier if you have experience with it. You can always come back here and ask for advice if you have specific questions.

You only need a free IMDb registration to be able to submit a new title or other data to the database, except if you are dealing with an "in development" title, for which one would need to be an IMDbPro subscriber. Since you said that "Fate of the Reprobate: Revelation" is already in production, the show would be past that stage and can at least be submitted by any IMDb user with a free registration. 

There is no special process in IMDb for registering oneself as an actor. During the new title submission process, you will just enter your own name as a director, cast member, and producer. If you have no credits listed in IMDb yet, you will get a warning that the name is new to the database, for which you should acknowledge that you are a different person not currently listed. Note that if there is already another person in the database with the same name as you, you will need to distinguish yourself from them with a roman numeral in parentheses after your name.

There is such a thing as claiming a page in IMDb, but that refers to an IMDbPro subscriber claiming their own name page (not a title page such as the one you want your TV series to have), so that they can add photos to their name page. If you don't subscribe to IMDbPro, it doesn't apply to you.

If you run into difficulty along the way, you can always come back here and ask your specific question (providing all the details), and the contributors or staff here will likely be able to advise you.

Good luck!