I'm curious as to how much research you've done in this area.
I traveled with Ward Hall's side show "Circus Unique" off and on and have worked with other carnival groups long before Jim Rose breathed new life into the niche. In my rather jaded view, I think anyone interested in this sort of thing needs to put some time in, under canvass and get their hands dirty; it will be the hardest work, longest hours, less pay you've ever seen that will bestow upon you mountains of experience, perspective and an amazing education.
Tony has given you some sound food for thought and in that I've but skimmed this thread I'm going to jump in with a few other ideas that you may want to play with IF you are looking at doing clubs or actual "shows" other than conventional busking.
I've used two major Freak Illusions (Spidora & the Headless Lady) for club act bits that went over in a very big way. The Headless unit was actually used in shopping malls as part of an April Fool's Promotion. In both cases Mentalism was the cornerstone; let's face it, spidy senses go a long way when it comes to supporting such phenomena. In the Headless I merged the paranormal with science (fiction) by having a headless psychic who was kept alive through an old 1960s era main frame computer (huge things). The girl operating the thing apparently used Phrenology and Graphology as a way to discern information about guests that took a seat in front of her. . . it was loaded with hilarity! The "Readings, being print-outs.
Spidora on the other hand, featured my old roomy Rod, a professional comic & female impersonator that did a righteous sharp tongued character based on Joan Rivers, Phyllis Diller and a hint of Sophie Tucker. We deliberately used the Harbin version of the Spider prop because of how high it sits and so, makes things more visible to the public. We did a classic blindfold and comedy Astrological reading sequence as the highlights to this act.
As a single person routine I think you've already been introduced to the mainstays that are "easy" -- glass or hot coal walks being super simple once you turn your head off and recognize just how safe it actually is. Fire Eating can get you into trouble IF YOU DON'T LISTEN -- safety is paramount alongside common sense. A bit over a decade ago a young lady that knew it all had her own volcano (dragon breath or whatever you wish to call it) flash straight back into her face and put her in the hospital while working a major casino in Vegas; it took that accident to wake her up, please don't let that be your story.
In the book
Erik Jan Hanussen: Hitler's Jewish Clairvoyant by Mel Gordon there is reference as to how to do several strong-man stunts that you may want to look into; especially if you are not built like a muscle man and can present yourself as a novelty -- a freak of science or perhaps, a wonder of science, depending on how you frame things.
Blood & Gore is NOT a common thing in this arena and thus, less is more. If you have the nerve to do it, look up the Human Pin Cushion and the name Bill Fitch, if you are into piercing this could work for you, especially if you used the Super Needle thru Arm as your kicker.
