You can try the recipe here:
How to grow orchids from seeds – kitchen style | Dokmai Dogma
Agar components should be available at your local healthy food market (agar commonly used as a vegetarian substitute for gelatin). I used this formulation quasi-successfully, in that I got seeds to grow, but never got them to maturity. You may do better with a commercial orchid flasking medium.
You should check the following post for an easy how-to on flasking the seeds
Very Easy Sterilisation Method - My Seedlings