I live near Preston and would be happy to go over the bike and show you the basics on how to look after it.
Courses are available through places like Edinburgh cycle coop (Manchester) sites .Have a look at their website.
Finding a decent shop is tricky, local cycle shops see a lot of kids bikes and do pram wheel repairs and often don’t have any experience of MTb specific issues. I’ve used places like Leisure Lakes at Tarleton and found them ok but they tend to have long lead times for workshop bookings. So much so I got qualified and I’m running a mobile cycle repair business based in Preston .
Regards
Richard