whereabouts in the country are you, emkana? the forms differ (although not always by much) depending on what area you are in.
ours (in two different counties) was a series of questions to answer about dd1's development and difficulties. do not feel you can only write in the box - I wrote all my answers in a Word document, and then printed and sent that - I used a separate page for each question or subsection of a question (there is no such hting as too much information, especially in a complex case).
also, depending on area (as these things tend to) - is your ds likely to get a Statutory Assessment first off? (not meaning he doens't have needs, but LAs can be tricky buggers and sometimes will refuse, make you appeal and go to Tribunal etc). if it is likely that your LA will play silly buggers, you might be better off making the application yourself, rather than the school - you still get all the same forms, some for you, some for school etc, but ultimately you as a parent have better rights of appeal than the school, I believe.
If you want, I can dig out the parental submission I made for dd1's statement and email it to you? (obviously won't be entirely relevant, as dd1's needs are different form your ds', but I found it helpful to see what someone else had written when faced with similar forms)