I take it the person with many options is you, which isn’t that clear from the sentence, so I would rephrase this a bit:

‘If I am new to you, and there are too many options for you to make up your mind, I can help you with this by making a demo of one of your songs.

If you like it, you pay for it and its all yours. If you don’t like, you do not have to pay for it and not use it. Glad to be of service!’

Or you can  just  Start Now!

upload@as-mastering.com

Your files and I will getback with more good news!