Welcome to OCDO.
1)Being 20 am i allowed to open carry "alone"? (I.E.:noone with me over 21)
No. This isnt like driver's education and obtaining a learner's permit. You are over 18. An adult. The firearm must be legally possessed- and likely through an interfamily transfer... (http://www.ag.ca.gov/firearms/forms/pdf/oplaw.pdf)
2)To open carry do I have to take a handgun safety course? (I know I should and I fully intend to as soon as funds allow)
No. You only need to take a handgun safety test to aquire a HSC, which is required to purchase a handgun.
3)I saw the law about transportation but its slightly confusing. I know I can transport in a locked container but again do I need someone that is 21 with me?
4)The weapon of choice I intend to carry is a S&W model 629 .44 Mag revolver. There are no safeties. (I.E.: no thumb safety, no grip safety, no safety period). Is that going to be a problem in the state of california for open carry?
This is very, very important: Hold your index finger about 12 inches from your face. Flex your index finger as if to wave hello to yourself. JUMPOFFBRIDGE89 meet 'booger hook'- 'booger hook' will be your safety. I am not aware of any requirements for firearms to have some external safety.
And before you attempt anything you read about here, please take the time to get educated on the law and the risks surrounding this demonstration of liberty. It would be wise to read as much as you can and locate a veteran member nearby. It doesnt take much to get sideways either legally or politically.