I would also recommend something inspriational to read when the weather's been duff for a few weeks on the trot and solo seems a long way away. The first gliding book I read was 'On Being a Bird' by Philip Wills - a great book of gliding days gone by and adventure - I'd recommend this to you. I happened across my copy in a secondhand bookshop aged 14 but you should be able to find a copy online fairly cheaply (or perhaps borrow from the library).
Have fun!