new person with speech problems

hi 

im 19 and only recently diagnosed with autism which kind of sucks because i didnt get help in school or college

i have speech problems (i cant talk except little bits with some of my friends) does anyone have any advice with other ways to talk? ive been writing notes and kinda making up my own sign language but only my mum and one of my brothers really understand that properly and even then they dont get what i try to say lots of the time so its kind of hard when i have nothing to write on somewhere