There are few tutorials available from Xilinx themselves. Here's one for example https://www.xilinx.com/support/documentation/sw_manuals/xilinx11/ise11tut.pdf. Also, you could join up an online course like the free one's provided by Xilinx. I managed to get through learning ISE by the instructors at an online institute called WorldServe. Seems a legit place to learn. Could send you the link if you are interested.