No braces, no semicolons, lots of parentheses (Lisp, Scheme, Clojure).
My favorite languages are: D, Python, Lua, F#. So what I syntactically prefer is all over the map.
Having tried my hand at creating my own programming language, I can give a few bits of advice.
Firstly, write a short but non-trivial program in your proposed language. Get a feel for it. Tweak it.
Before you actually begin to implement the interpreter.
My second bit of advice you already have covered: look at other languages, and see what you like or don't like.
My third bit of advice you probably won't like, so I will refrain for now. So as not to dampen your enthusiasm.
Is the third bit of advice "don't"? Having spent way too long designing an "implementing" a toy language of my own, my first advice to anyone looking to make a toy language would be "don't".
lol ... the third bit of advice is: it's hard, and takes a long time. And if by some miracle the language becomes popular then you'll end up doing hard time and manual labor (i.e., you'll have to write the manual).
I lifted the manual labor joke from Bjarne Stroustrup.
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.