Follow this guide for now:
Beginner's Guide - Ikariam - a Wikia wiki
As for the buildings, by learning more researches you will eventually unlock more buildings.
EDIT: eh...you all post too fast <<;
Originally Posted by AurorasParadox
I'm in gamma...
Can a person have 2 accounts but on different servers?
Err... at what price should I set my goods at?
First one: yes.
Second one: check the offers on what everyone else is selling them for.
Marble's usually 30-40g each
wine's 25-35g (all those ppl who price more than that should die! D:<)