You should have 3k rupees after finishing /tutorial, +1k for joining website signing up in game, +5k for refering someone (he/she also get another 5k for this btw) and 5k for signed in on EMC website, as i just check my alt rupees history. In summary you can have 14k at start. After that: vote every day, login, get stuff & sell (make a shop) and support EMC if you like. That will get you rupees (and other worth rupee stuff. Don't forget to get your promo today (type /promo) Cheers
I was broke for a really long time in the Empire, but in that time I was hoarding promos. After a while, I sold them and made a million rupees. That's something you could try, but it won't get you money instantly. You have to wait until they're valuable and then sell the promos. I also had a voting streak of 300 or so. That helped a lot. I stopped voting when I became inactive on EMC.
Some really helpful suggestions already, but if you're looking for more information check out: This wiki page on Rupees under "How can I earn Rupees" or Aikar's Guide to Earning Rupees which is a bit old but still very helpful. Good luck