Beginner with fungus on my first orchid (phalaenopsis) and no clue what to do. Help!

[calypsoB]

I concur with Mervin that this looks more like a bacterial issues than fungal. You could try doing an antibiotic spray over the leaves to stop it but that one looks a little far gone, so probably needs to get cut off. I also saw on another post that you could use ground charcoal to help the infection. I am personally having great results using the streptomycin antibiotics. good luck!