If you are doing a senior project as part of your major, the Honors Program may waive the HON 498 requirement. You will be expected to produce a thesis based on your senior project and fulfill all thesis requirements. Depending upon how much thought you have given to your thesis, we have two suggestions. This is an opportunity for you to start working with an advisor, planning your thesis, and doing some research. There's a little of the chicken or the egg about these.
Some students start with the topic, others start with the advisor.
Perhaps you are certain as to the focus of your thesis. In this scenario your next step is to find an advisor. With topic in hand, you might informally chat with professors with whom you've had good experiences in the past. One of them might be a good candidate, or they might be able to direct you to others for whom the topic might be more appropriate. This might take some time, but you are bound to learn in the process.