+1 for Paul Sellers. He's a bunch of content on finishing too and I've just tried his combo of shellac + beeswax to finish pine and it works fantastically and is cheap.

Also, not youtube, but https://www.ukworkshop.co.uk/forums/ is a great uk online resource, including this thread https://www.ukworkshop.co.uk/forums/timber-yards-wip-add-you... on sourcing timber