There are many user created tutorial that will guide you step by step
Follow this link Fixture Creator Help

• Fixture Creator - Pictures and Icons
• Fixture Creator - File name Convention
• Fixture Creator - How to organize your fixture files
• Fixture Creator - How to backup and exchange fixtures

• Fixture Creator - Before making a fixture.
• Fixture Creator - If I don’t have the DMX table.

• Fixture Creator - Tutorial Middle value

• Fixture Creator - Movement Configuration
• Fixture Creator - Beam Configuration
• Fixture Creator - Lamp Configuration
• Fixture Creator - Gobo Configuration
• Fixture Creator - Color Configuration
• Fixture Creator - Macro Configuration
• Fixture Creator - Custom control
• Fixture Creator - Reset Channel Configuration
• Fixture Creator - Framing Configuration
• Fixture Creator - Channel Description Tab

• Fixture Creator - Fog / Smoke Panel

• The "Show In" feature
• The "Formula" feature

• Adding and Removing Fixtures in FreeStyler