Theme advice please

I am really brand sparkling new and am super keen to learn, but I just need to get started. I need to create a website for my coaching business and need an easy theme, for a blog and outline of services etc., that is compatible with buddypress and bbpress as I need these to create private and 3-4 groups in which we discuss anything coaching, so people need to log into the area in which they are working.

Second simple question, I need to buy a domain - do I do this first and how does the domain name and the website link together.

Thanks for your patience with these basic questions, super keen to start but after 3 days of searching am just so confused with all the different options out there.

Thanks a million.
Cheers, Dawn

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