Redfield hit the nail on the head with regards to Servisair (non load control) dispatchers.
Basically Ops create the load sheet/load plan and digitally sign it i.e. put their name on the sheet, as loadsheets need to be signed by the person who created it and the captain.
If you are ever asked to sign a loadsheet you didnt create OR LMC a load sheet (and you are not LC trained) refuse point blank. Its not worth it should anything happen. Most captains will LMC the load sheet for you except the odd one who thinks he is god and will demand a new loadsheet to be created.
Good luck as you will enjoy it. It can be a cusshy number aswell