Its great to hear that your have the travel bug at 16 yrs old!!! And welcome to the Travelpunk.com family!!!
Eastern Europe huh? Well i do know there are a couple of memebrs here who can give yoiu the low down on Eastern Europe, like kerouacscabbie, and I think verstehen, hopefully they will jump on this post, and any others who can fill ya in on some info.
For some info on what rail pass you should get, here is the contact info for Rail Europe Agent in Sinapore
Singapore Travelex Singapore Pte Ltd
50 Raffles Place
#01-02 A/B Singapore Land Towers
tel: 65 360 002
tel: 65 343 211
fax: 65 423 0062
They should be able to help you in picking a package that will best be suited for your needs, there has to be a way around those "Limits"
Here is the Travelpunk.com Eurail Info
section of the site, which might give you some options aswell.
Here is the US travel warning page that can give you any current and past warning about a specific country your going to Travel Warnings
I think thats about all i can help ya with, but i think the others will be more than happy to help when they come on...just keep checking in and maybe even PM them for some imput.