Orchid seeds don't have food like other seeds. In nature, they germinate but cannot grow (starvation and die) without help from mycorrhizal fungus which provide food. However too much fungus could kill seed. The chance a seed survives in nature is less than 1 per million.

The keywork of germination orchid seeds in vitro is contamination. If you can control the contamination then the rest will be easy. Buying a brandname commercial media (few bucks) gives you more successful chance. If you cann't, use 1.5 g/l fertilizer with micro nutrient, 20 g/l sugar, 8 g/l agar. Choose an easy growing seeds such as Phal, Den for the first time. They take only 1-2 months to become plants. Some difficult seeds can take more than 6 monts. They need a dorminant period; they depend on the season. Cheers.