see https://codex.buddypress.org/theme-development/wordpress-to-buddypress-theme/
There are great volunteers on this forum. When they have the time, I am sure they will assist you.
In theory you can use any theme but you’d have to use the template pack https://wordpress.org/extend/plugins/bp-template-pack/ to add the files you need which is what that link valuser supplied does. To be honest, it’s going to take some work / adjusting it’s a case of not knowing how much until you do it really.
If you are not comfortable with doing this then I’d personally recommend you also have a look at some BuddyPress themes. You can purchase themes for BuddyPress with all the support and bells and whistles of WordPress ones so perhaps that would be an option. There are also a number of very feature full and robust free themes for BuddyPress. https://buddypress.org/extend/themes/
Valuser and Karmatosed, thank your replying – I really appreciate the response and I’ll be looking at your suggestions. Thanks!
