I had the same issue when I moved here last September. I highly underestimated the amount of stuff I had! I packed the clothes I needed in two suitcases and brought them over with me. I used Creighters and Freighters for my large items, which took about a month. For books (and, as a former English teacher, I have A LOT of them), I used M-Bags from the Post Office, which take 4-6 weeks but are MUCH cheaper than conventional mail. I still have quite a bit of stuff at my parents' house in the US that I am in no hurry to get over here. I have been back twice since September and will be going again this fall, so each time I bring back another "load" and send some more of our wedding presents via regular mail.
Good luck!