Hi Diane,
Thank you for your question. It can be hard to find just the right formula. I personally have not done this myself, I often buy base creams form my herbal supplier. But you could buy a plain cream from any pharmacy or health food store. Your oils and tinctures should still mix in fine.
Once you start adding other things like waxes you will need a better emulsifier I think and more water perhaps to balance the texture. If you are still keen to make your own cream, take a look through the comments on the ‘External Preparations’ or ‘Body Care’ threads, as I know there has been a few discussions about good recipes there.
With warmth and best of luck,
Benna