this ain't no get rich quick kinda thing. first of all, if you're thinking of selling gyraf cloned stuff, etc... then get that thought outta yer head. that's hard work someone did to give us all a circuit to play with, learn from and use. it would seem disrespectful to then sell that stuff. you know, unless its like a special project for someone you know, etc. but doing that kinda stuff on ebay seems like a real diss and hurts the community here in a way.
so, the other way to go would be selling your own designs... which seems like a long way off as you are just getting into it. prepare yourself to fail a lot, and to spend more money than you'll recoup for quite some time. and maybe years down the road there might be people willing to spend money for your work, but there is no guarantee.
this is kinda an interesting time on the forum, as the intellectual property, so to speak, of some members has become the topic of some debate. we are fortunate to have such generous people here from whom we can all learn. think of the time they spend tinkering, and then think of the tons of time they spend documenting their trials and tribulations in acrobat files and postings on this very forum. i can't figure out why they do it, unless they really do love it. and for that we are all grateful. and if you become one of them, then forget ebay, as there is a concentrated community of educated and savvy consumers right here who know the value of this hard work, and who would be willing to support those exploits through the black market etc. as a means to bigger and better things (NYD, start your own badass audio company somehow!)
whatever you decide to do, good luck. this stuff can be confusing as hell but really gratifying too.