Downloading Scores

I am a visually impaired amateur musician and I’ve just ordered the 12.5 MusicOne stand and tablet with AF and pro .I’m not brilliant with IT ! I sing and play clarinet and piano . My question is : how do I access full scores of music such as The Messiah or a clarinet concerto ? Do I scan them or can I download stuff like a book on Kindle ? Sorry to sound so clueless , but I’m ( hopefully) not just going to need individual short songs …TIA

Hi Cathb
I have replied to you from our Support Desk.
See video about IMSLP: