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Look in the trunk, there is cover for the brake light, remove and you will have access to change the bulb.
yes
In the gas tank. I have 2001 Echo.
Remove the immobilizer unit?
2001 Toyota Echo doesn't have a timing belt.
http://www.carspace.com/guides/Toyota-Echo-How-to-change-oil
http://pdftown.com/2000-2002-Toyota-Echo-Service-Manual.html
Yes
manual recommends Dot 3.
no idea it is probably using the brake fluid
3.5 Liters