As a parent of two, non-verbal autistic children, we've worked with Early Intervention as suggested by other answers. In Illinois, EI services are only provided until age 3 (which may vary state to state). Unfortunately, it could take months to get services started. Worse yet is finding the right therapist to "fit" your child's (and your's) specific needs and schedule. By then, your child will age out and have to use services provided by your school district via some kind of Early Childhood program. We actually moved to a new town to get into a better Early Childhood school district for my kids.
In Illinois, at least, the law states that if a school is unable to provide an Early Childhood service, then that district is responsible for bussing your child to another local district. I was concerned about my (then 3 year old) son riding the bus for nearly 90 minutes one way to a special school two towns away.
Oh, as an aside, you should probably get prepared for the inevitable IEP meeting (which is a whole other set of frustrations).
My oldest son has learned to use Picture Exchange to show us what he wants. The speech therapist from his school has been the most effective by far teaching him how to communicate with this method. We've had about 4 different speech therapists via EI and NONE even mentioned doing something like this for him. Expect frustration with any therapies. My oldest has sensory issues and covers his ears even during normal conversations in the house. "Conversation" with him is impossible when he is over stimulated.
I would avoid the noise on this thread about limiting your child to this or that. Every kid learns differently. You will find whatever preferred activity your child loves to do and USE IT TO YOUR ADVANTAGE. The bottom line here is getting your child ENGAGED and you JOIN IN! Think about how you interact with your co-workers and family and ask yourself how many conversations start with some television show, sports broadcast, facebook post, tweet, news. Yeah...thought so... Mickey Mouse Clubhouse is like Sports Center for 3 year olds.
Ultimately, you should bring up any concerns about your child's developmental delays with your pediatrician. If you have a concern, get your child tested (hearing, autism, whatever). The earlier you start therapy services the better chance your child has of overcoming their developmental delay.
Best of luck!