First things first: Welcome to Belegarth! Stay out of the General Mayhem for a bit until you learn the general boards etiquette.
Where are you located? Pending where realms are around you, it could make it a lot easier to get a realm started, or there might be one in range for you to visit.
When you say Dragonborn, do you mean the D&D Dragonborn? There are ways you could personify that through paint and some things, but it's understandable that you'd want to avoid it. You'd end up looking like a lizardman to most folks. To be honest, that's not totally detached from what you're looking for.
There is information on Belegarth Lizardmen here.As far as races go in Belegarth, it is totally up to you. Whatever you want to portray is what you can be. The only thing I will suggest, an idea from another member, is "If you have to tell someone what you are, you're doing it wrong." So pick whatever race you want to be and do it like mad.