You can have beans on phase 1.
I believe (correct me if I am wrong) in the original book, beans were not allowed on phase 1. However in the revised SBD book beans were added into the allowable phase 1 menu as well as milk/dairy
See this page
for update phase 1 foods
Also, if you eat eggs, they are a good source of protien.
I know alot of the vegitarians that have been on this board use the soy based meat substitutes (ie: Boca Burgers)... just have to read the labels to make sure the ingredients are all SBD friendly.