The first thing you do in an experiment is define your research question or hypothesis. This is the foundation of your experiment and will guide all subsequent steps.

Here's a breakdown:

1. Identify your research question: What are you trying to discover or understand?

2. Formulate a hypothesis: A testable prediction about the relationship between variables.

Once you have your research question and hypothesis, you can move on to the other steps of the experiment, such as:

* Designing your experiment: This includes selecting your variables, choosing your methods, and determining your sample size.

* Collecting data: This involves carrying out your experiment and recording your observations.

* Analyzing your data: This involves interpreting your results and drawing conclusions.

* Communicating your findings: This involves sharing your results with others through reports, presentations, or publications.

Let me know if you'd like more information about any of these steps!