Ideas of where to publish a novella

I wrote my first book the year I turned 13 - in my head. In all of my youthful naivety I presumed transferring it to paper would be extremely easy after all anyone who can daydream for hours on end is practically writing a mental book right? wrong.
My first novella obviously unpublished and almost unsalvageable came up to just 7500 words and this took me months to write, talk about eating humble pie.
to make things worse I got one rejection and went into hiding, its been 3years since I got that polite rejection and I have not sent a query off since then but I am officially back in the game now with words in the 20,000 range.
I'm proud to say 3 manuscripts, 1 query letter and 1.5 synopses are ready, the next stop is finding a publishing house, I understand most agents will not touch anything less than 50,000 words, so I have decided Samhain and Carina Press are it.
wish me luck