Anyone on here play a trombone by any chance

our eldest has just got one through a council music programme, and has once weekly tutoring at school with it, this week he was finally able to bring it home, now neither of us are musical (love music but couldn't tell you what any of those squiggles on those lines mean) so we can't help him in any way, so was just wondering if there were any brass players that could guide us on where would be a good place to start.
He has been told of one book he needs to get, but I would like to get him a couple to keep his interest up as it has really caught his attention, and don't want the interest to wain, I'd also quiet like it if he learnt a few more notes as monday night we had an hour of trombone practice, all three notes, over and over and over and.....
So we either need to find something for him to read/practice to or buy ear plugs
Sarah
the ever growing luvpie household currently contains, 4 boys, 4 chickens, 2 cats, 2 rabbits, 4 fish, an empty tropical fish tank waiting new arrivals, now are we daft to look at our broody hen thinking, if we got some fertilised eggs........