Follow a few simple technical rules and then some creative rules and you'll be fine.
Technical:
1) Must be legible and clear up close and far away. (Scaled large and small)
2) Works with the colors reversed and in Black and White. [in other words, your title works against a white or black background.]
3) Don't use an uncleared font (you don't have rights to).
4) Search to see if your title is already in use.
5) Make several versions, some that are vertical and some that are horizontal.
6) Do not make every word the same size or level of importance.
7) Study the titles that are effective and not just from popular properties.
Creative
1) Treat your title like a logo and make it an Image Of Words
2) The shape of your words should be easy to recognize.
3) Don't use a font as is, edit it and make it (more) your own.
4) Avoid strange words that your (target) audience is unfamiliar with.
5) Search for titles like yours and avoid being taken as a parody of another property.
6) Pick a title that SOUNDS good AND LOOKS good. Easy to pronounce.
7) If you feel compelled to use a bad title, reconsider and make it a subtitle.
8) Make several versions (no matter how great you think the first try is/was) and compare
9) A plain title can be jazzed up by adding non-words, including symbols and shapes.
10) Study MANY titles and avoid copying - even if you think it's an obscure property.
After all that, you probably need to post some stuff so your peoples here can give you specific advice and pointers.