pretty much you just talk as your character to help you develop them
i have found this to be quite help full
please use the format where you have your characters name, a : then your characters dialuge
ex.
Ash: hello, my name is Ash *gives a small wave and smiles* please use She/Her pronouns!
spelling mistakes are okay, heck i have more misspelled words in a sentence then i do ones spelled correctly. so in short dont worry about it, same with grammar