Do you know how you must cut [them]?
Do you know how you must interpret?
Do you know how you must colour?
Do you know how you must try?
Do you know how you must invoke?
Do you know how you must sacrifice?
Do you know how you must send?
Do you know how you must kill?
Whenever someone asks me how to get started on creating galdrastafur I always think of this poem from the Havamal. Odin in here gives you the starting point. First learn the elder futhark until you understand the meanings and names and then learn the younger.
Vikings did not use the elder futhark. They used the younger. For divination they used the younger futhark and for galdr they used the younger futhark. Viking aged magickal texts use the younger futhark.
You then study the terminal staves and their meaning. How they were used in galdrastafur creation by viewing old manuscripts like the galdrabók skuggis skreed and the like. You can find some of these on galdrastafir.org
You will need to study older manuscripts in order to see how they were used back then. What types of woods? What metals? What taufr? This takes years to develop so don't feel frustrated. I have been on the Norse path for more than 25 years. Start by learning the futhark and create your own runes. Sacrifice to them and learn more about them.