I am glad to hear that you are interested in the fascinating field of handwriting analysis! I have been looking a bit on the internet and I think that the best resources I have found that discuss handwriting analysis are:

handwriting

(I found this page in the website to give a very nice introduction:
what is hand writing analysis?

ahafhandwriting (this website is a society page, but contains some very interesting and diverse information and may enable you to contact handwriting experts in your area)

what-shortcomings-handwriting-analysis (a very short webpage that discusses the shortcomings in handwriting analysis)

Thanks for your great question and I hope these pages give you a good start to your research!