ANSWER:

You must not take orders of birthdays, anniversaries etc and the money earned through such orders will not be halal for you. If they order a cake but you don’t know why it is for, there is no sin on you in this as you don’t have to investigate or ask! 

I am planning to start a buisness of baking and selling cakes.. if someone will order cake for birthday celebration , will it be haram for me to sell it? The money which i get from the customer will it be considered haram money?