When you are buying lenses, just remember that they will last LONG enough than your camera body. So it's always suggested to be wise while buying lens.
If you are planning to do professional quality model photography, event photography (for example wedding) etc then straight go with Tamron's 28-75mm f/2.8 . Its an all purpose lens with outstanding image quality at cheap price and it can compete with it's rival from canon's 24-70m f/2.8 L USM. But that canon lens costs almost 3 times than this Tamron. Beside that please buy a 50mm f/1.8
If you are planning to use your camera for general photos, family photos, travel photos then buy 18-135mm and another 50mm f/1.8 . The 18-135 focal range will save you from changing your lens in a busy road or in an awkward moment without missing the moment :) If you want to save some money, then buy Tamron/Sigmas 18-200mm.
If you are planning to do only landscape, nature etc - then buy 18-55 and one 55-250.
Thats mainly it :)