Hello everyone! I am new to Arduino and this kind of things xD, for a project, I have to do something with assembler, I am already learning about the Arduino IDE but, can you suggest me how can I program in assembler and upload it to the Arduino? Something as blinking a LED would be really nice, I just need some starting point so I can do "what I want"...I know that I am running before learning to walk, but any help would be appreciated 
Thanks a lot!
You can use Avrdude to upload a hex file to an Arduino - that is what the Arduino IDE does.
And I guess you can get an program to convert assembler code into a hex file.
As an easier option you can include inline assembler code in an Arduino IDE program.
If you want to learn assembler that's great.
But if you just want to create a program for an Arduino use the regular C++ and let the compiler do the hard work.
...R
If your wanting to use purely assembler then maybe the Arduino IDE is not the best place to be. Have a look at Atmel's own IDE here.