Of course you can! That would be just fine. As for the herbs, you can easily find them at your local supermarket or even a grocery store. You can find herbs like Cinnamon, Nutmeg, Allspice, Cloves and so many more there. If you want some good ritual based incense, that would range from Sandalwood, Frankincense, Myrrh (Frankincense and Myrrh are usually mixed together due to their banishing/exorcism properties), Dragon's Blood (Good protection incense. It also amplifies (increases) the power of the spell you're doing if done correctly). Hope this helps!