So, you think I can help you? Great news.
In the first instance, it's probably a good idea to give me an idea of what you're looking for help with and how you think I might be able to do that. Once we're both happy and in agreement on everything, then we can begin working together.
I'm happy for you to either set up a phone call with me or to drop me an email, it's your choice - the reason I prefer to plan my phone calls is to avoid context switching in my daily work.