In order to create a custom race, my suggestion is deciding the powers of the race and "pricing" them in DPs (using the Creation of Beings rules or the common sense when you're making something different). Then if the race has between 5-100DPs worth of powers it has a Level Modifier of +1, if it has between 105-200DPs the Level Modifier goes up to +2 and so on...
Anyway, there's a topic about new races that includes quite a number of those.
If you'd be so kind to post any your racial creation in the very same topic, it would be nice!
Also, if you look around there are topics for: Custom Magnus, Custom Classes, Custom Advantages/Disadvantages, and Custom Techniques. If you come out with any new creation of such things, post them in the appropriate topic if you like.
Oh, and welcome to the forum!