Research Project

hello, i was wondering if someone might be able to point me in the right direction. i'm an illustrator and i'm thinking of doing some traveling around europe - part holiday and part work.

very briefly, my idea is to travel around and acquire information to make my own travel journal of my trip. then on my return i will complete the design of the book in order to (hopefully) get published and use it as a promotional tool for my own work as well as a potential money-earner.

this trip however will cost me a lot of money, and i was wondering how much i can expect to put through as business expenses? i'm a registered freelancer and have claimed on various business related trips before, but none of a more 'research' based agenda.

can anyone point me in the right direction of information regarding what i can legitimately claim?

muchos gracias!
felt tip.