1 Year through Asia - Advice Appreciated!

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Hi

I am travelling to Asia in January 2009, for 1 year, and would appreciate any and all advice.

--Flight is Toronto-London-Bangkok
Landing in Thailand (Bangkok)
--3 weeks southern Thailand
--3 weeks Northern Thailand
Enter Laos
--2 Weeks in Laos
Enter Cambodia on river boat via Mekong
--2 weeks Cambodia
Enter Vietnam (south)
--1 month to get to Northern Vietnam
Access China (understand Visa's are attainable in Hong Kong?)
--2 Months in China
--(Southern/Central, North-east, Tibet)
Enter Nepal via Tibet (advice?)
--3 weeks Nepal
Enter India
--4 Months India
--(First the North, working West, then South)
--Kolkatta - Beijing flight (on Chinese transit visa)
End
--Trans-Mongolian Express, Beijing-Moscow 10 days


So thanks in advance to any advice anyone can give me, especially on Visas, border crossing (Laos-Cambodia-Vietnam, China-Tibet-Nepal-India), and India and China in general!

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