We know from the Myths, that Thorr blessed the funeral pyre of Baldur with his Hammer. We also know from the Sagas that Thorr's Hammer was used to bless brides, babies, and the Folk. A ritual sized Hammer is also a must. Mine was a gift from my foster father, and is hand carved from cherry wood. It has served me and the Folk well for twenty years. The Hammer is also used in some Blot is for the banishing ritual, and later to bless the Feast. I have seen some Gothis use a sledgehammer purchased from the hardware store, and I know of some prison Kindreds who use a rubber Hammer. Again, what is important here is the symbolism, and the power in the blessing projected by the Gothi. Improvise!
The last of the most important implements is the Stalli, Old Norse for altar. We have a stalli made of stone at our Hof, and I know of many who have constructed Stallis in their sacred groves. The Stalli, of course, is the focal point of the Blot, and holds the necessary implements used during the service. I have also used a simple folding camp table, which has served me well, both during the Blot, and the ritual Feast to follow.
Books in PDF format to read:
Aleister Crowley - The Equinox Vol I No IIda Craddock - The Wedding Night
Devi Spring - The Emerging Indo Pagans
Aleister Crowley - Songs For Italy