@Edwin-Ascencio It doesn't look like have any level shifting circuitry on the serial tx/rx so the 3.3v from omega might not be high enough to drive the 5V uart on screen. You are also feeding back 5V into the omega via the rx pin so could possibly do some damage over time.
OP's circuit is OK - level shifting is not needed between Omega2(+)'s serial port and Nextion NX3224T024 - Generic 2.4'' TFT Intelligent LCD Touch Display.
See also NX3224T024_011 datasheet.
Little update: for now I'm trying just to connect a light sensor read the data with i2ctools
The i2c sensor is a BH1750FVI, I'm able to retrieve the address ( 0x23 ) with i2cdetect but if I try to look for some data with i2cdump there are all zeros...I've tried to put the sensor under a light or in the dark, nothing changed.
@Eric-Min Welcome to the community.
Just have a look in the Wiki there it has a project section.
The audio streaming project looks not so complicated and you will need just a usb audiocard.
Just use it as it is .. opkg. Make a postit close to the monitor to remember the command ;) I also prefer apt/apt-get but if you want to work with several Distributions of linux you have to get used that there are a lot of packet-managements.