A workshop facilitator's basic tools can be roughly divided into 3 categories:

1. Activities: Exercises you can engage people in to develop and validate ideas. For example, post-up, role-playing, brainwriting, etc. With time, you’ll be able to build your own collection of activities that work well in different situations.
2. Materials: Physical prompts that can help you do these activities. These include sticky notes, sharpies, voting dots, whiteboards, etc.
3. Techniques: Tactics you can use to smooth out communication between participants. For example, prompting people to speak up, asking for contrary opinions, or bringing unrelated comments back to the topic at hand.

The more you facilitate, the more robust your toolkit will become. In time, you'll build your own collection of materials, activities, and techniques and learn what works best for different situations.