Have fun with it Rebekah - you will get new and interesting results...and hopefully the colors you are looking for.
Regarding a scale - you can buy an expensive gram scale, but you can also get inexpensive scales from Amazon that do grams and offer the 'tare' . This is the link to the scale that I have been using for a couple years, with success,
Ozeri Pronto Digital Multifunction Kitchen and Food Scale, Elegant Black $12.47 Prime
Granted it does not do 'tenths of a gram' buy I round the value up or down and have noticed no ill effects.
Let us know how the firing goes!