Finally I got my USB stick to boot into Yosemite-Zone, but when I select it, the Apple logo appears, and freezes.
Since in some cases you need bootflags, recommend me some that I can use to install it.
This are my computer specs:
TOSHIBA SATELLITE NB15-A1101KL
Processor: Intel Celeron N2820 Dual-core @ 2.13GHz
Graphics: Intel HD Graphics (1366x768 res. at 60Hz)
HDD: 500 GB (Dual boot with Windows 8.1)
BIOS type: UEFI
WiFi adapter: Qualcomm Atheros AR956x