Reddit mentions of Wrightslaw: From Emotions to Advocacy: The Special Education Survival Guide

The school system will do evaluations and assessments and if he does qualify for special education, they will make an IEP and then you can look for services such as ABA if that is what you would like to do. The IEP process can be confusing and intimidating, and I highly recommend buying a book about IEP & special education laws (something like this http://www.amazon.com/Wrightslaw-Emotions-Advocacy-Education-Survival/dp/1892320096/ref=pd_sim_b_1?ie=UTF8&refRID=1EZY9R4M8VA69ZEV2Q2W )

You can also get a referral from your doctor to see a specialist and get additional evaluations done if you are not comfortable with only the school district's evaluation.

Texas has a program that offers ABA therapy and other services to children between 3-8 (once early intervention services end at 3yrs). It is funded through grants and is on a sliding scale depending on income and services required.

http://www.dars.state.tx.us/stakeholders/autism/index.shtml

I know this is all a lot to take in and try to sort out. The beginning of this journey will be tough but it gets better. The CDC has a great roadmap for what to do once you suspect your child has autism. It's got great suggestions and strategies.

http://www.cdc.gov/ncbddd/actearly/concerned.html

Autism Speaks has an awesome resource for parents in the early stages of the process that introduces everything you will need to know to make well-informed decisions . It's called the First 100 Days Kit.

http://www.autismspeaks.org/docs/family_services_docs/100_day_kit.pdf

If you have more questions while you are waiting for services, feel free to PM me and I'd be happy to help.