Is there anyone willing to teach me or give me a link to something that i can use to teach me how to make server and client packets. i have a custom inventory that i want to try to get to work again and the help would be appreciated.

Forge's documentation has a section on networking here. This includes the Simple Network Implementation, which you should use to send your packets.

Thanks that helped alot. it doesnt tell me one thing is how do i make  a packet that opens a gui. It gives me that basics but it doesnt give me the full story.

Send a packet to the appropriate side with the necessary information and then open a GUI from your packet handler.

 

Are you sure you need to send a packet? What type of GUI is this and where are you opening it from?

its a inventory gui. where it loads the players inventory

Where are you trying to open it from?

 

If it's on the server (e.g. when the player right clicks a block/item), just call

EntityPlayer#openGUI

directly and FML will send a packet to the client telling it to open the same GUI.

 

If it's on the client (e.g. when the player presses a key), send a packet to the server and then call

EntityPlayer#openGUI

in the handler.

Some stuff (1st point in this case, maybe others) if you didn't already catch it: http://www.minecraftforge.net/forum/index.php/topic,39341.msg207122.html#msg207122