It’s hard to know where to start so here are some of the books I’ve found useful, in order of “importance”, if you can only read a couple, start at the top:
Reid, G. & Green, S. 2011 100+ ideas for supporting children with dyslexia. London: Continuum
Reid,G. 2011 Dyslexia- a complete guide for parents and those who help them. Sussex: John Wiley & Sons Ltd.
Schneider,E. & Crombie,M. 2003 Dyslexia and Foreign Language learning, Oxon: David Fulton Publishers