Minecraft interacting with player movement using code

Hi,
I have started to learn C# and Java and wanted to make a project but am in need of some help. I want to move the character in Minecraft to place blocks in specifc places depending on where its standing, also that when you type soemthing like .cactus 1 2 5 it will build a cactus farm (starting where you are standing) that is 1 x 2 and 5 high. I have found tutorials on things like this but they just show what to type and don't explain anything so it doesn't really teach me. I am willing to pay for someone to teach me how to do this and what language its easiest in!
Thanks in advance,
Adaman

Video of what I want it to do:
search on Youtube: ClientX Cactus Farm Builder by BigL

1 week has passed and no further replies have been made by the OP. Assuming solved.

/Closed.