Searching for a job is exciting! Like Kim said, I would also starting with Indeed and Glassdoor. You can search with keywords for the type of job you are looking for. Be sure to set your location in Indianapolis.
Another great place for those just entering the workforce in Indianapolis is Ascend Indianapolis. They often work with students to find internships and jobs in the Indianapolis area.
My last suggestion would be to look at professional organizations in the area. Start with a google search of "(job industry) Indianapolis association. Those groups might have a page for job opportunities or frequent events in the area.
Happy job hunting and good luck!
To get a general feel of what's out there, you should look at the postings on "indeed.com"
If you simply search for "Indianapolis" and leave the type of job blank, there will be 25,000 jobs. On the screen displaying the jobs, at the top of the page, to the right of the blue "find jobs" link, there is a link that says "advanced job search." Select that. It gives you the filter boxes. Go down towards the bottom where it says "Where and When" . On the first line, change location to "only in" Indianapolis, rather than within 25 miles or so. On the next line, I change the time to within the past 7 days. You can go to 15 days, but I would not go further back than that. This will give you 2500 - 4700 jobs.
If you have specific jobs in mind, click on advanced job search again, and start playing around with the filters towards the top of the page. Hope this helps!