I'm don't have much experience on electronics, is there any precautions that I have follow?
The first lesson I got was "never catch a falling soldering iron" ..
Bluetooth is essentially a serial connection, so I would suggest to first get the individual sensors to work one by one and get the output on your PC.
In a second phase you increase the number of sensors and you improve the data written over serial TIP: use { time ; sensorID ; value } triplets
IN a 3rd phase you include the bluetooth into the whole
Do you have a schematic or code already (partial) you can post so we can react on that?