You would need yagya Kund and Pictures of Gayatri(or any God) in addition to what is in List of Yagya Items page.

1. Prepare a stage/alter with Gods Pictures, Lamp, Kalash and Agarbatti
2. Setup Yagya Kund over a stand, wooden plate, tile or oven/steel plate. Review this Youtube video to see how setup and simple yagya is done, so you can do required setup. Hindi variation is in here
3. Take Asana and sit around yagya kund.
4. Follow this 1 hr yagya procedure(Hindi) There are other variations in this list including ones with more English explaination