Start online. 

Use college search engines to start. Here are some we use:

https://bigfuture.collegeboard.org/

https://www.collegedata.com/

https://www.collegetransitions.com/dataverse/

https://www.collegeraptor.com/

https://nces.ed.gov/collegenavigator/

Factors that influence your search should be:

-Strength of Major

-Location, Size of Campus, Travel Expenses

-Tuition and Housing

-Class Size

-Graduation Rates

-Career/Employment Statistics/Internships