All grains and pumpkin go in the mash. If the pumpkin is in the boil you will most likely lose a gallon of water, and have a tough time straining the pumpkin out.
If you really want to put the pumpkin into the boil then you should use a grain bag or filter the wort before racking to your primary.
The pumpkin should be cleaned and cut into small cubes and baked for 45 mins at 350, then mashed and coated with honey. Then baked for another 45 mins at 350. Let it cool to 154 and add to mash.
For the vanilla bean vodka solution, two vanilla beans are cut in half. The seeds and goodies are then scraped into 4oz of vodka. Let the vodka sit for two weeks.