I wonder to know how much I should charge a cake? I'm a beginner and I make everything from cakes, buttercream, fondant,and gumpaste from scratch.

pretty cake and beautiful colors.
WOW! I can't even imagine making my own fondant ,let alone making gum paste.You are brave
well,You should check the rates and prices around,call and visit local bakers and cake stores.
Then calculate YOUR cost on a cake.How much it costs YOU to make x number of serving wedding cake,include the price of boards,plates,pillars,eggs,sugar etc...
That should give you an idea of exactly how much you will be making as your profit,when you compare it to the price/serving.
dont forget to calculate your time as well
Good luck!
- h

Honeycakes: Thank you so much for the advise. I have a lot to learn about cake decorating.

Plan a day to just sit in front of the computer and read every single thread in the business forum. Much pricing info is in threads that is NOT entitled "pricing", which is why I encourage you to just sit and read ALL of them.

It's a goldmine of information and you'll be amazed at how much knowledge you can pick up here!