I'd look around
Sub Guide]. You may have to do some digging but there's good info there from anything for beginners to more advanced play.
There is very little out there because it is so personal. What works for each couple, and each sub vary so much that it's impossible to just make a list. What some would consider humiliation and/or punishment others may find arousing. For me, humiliation would be purely punishment if it it's my owner that I was to feel the humiliation from. Random people wouldn't do it so wearing a leash in public I'd find fun, but being degraded verbally by him would crumble me in a way a punishment intends. But, that's rare. More often than not he takes away himself... no contact whether it's verbal or physical.. that's the hardest on me. Anything else I don't tend to take seriously.
Essentially find things you hate... those are punishments. I know people who can't stand having their collars off, to them that works. To others it's just metal around their neck. Try looking through BDSM blogs. Real life situations are what tend to give the most ideas. Just know your limits... telling your master that having your nipples nailed to a board would be a punishment is great.. until he tries it
Like I said, it's all individual.