for step 1 i'll have order some sensor, and i already have an Arduino so i'll use that. much like in this video.
the sensors i have ordered are as follows :
-sd-card slot (data-logging)
-BMP180 temp and pressure sensor (alti sensor)
-GY-521 MPU-6050 module (gyro and accel sensors)
i ordered them from light in the box, so it takes a while for them to get here. but really, what can you say if its not even 15 EUR.
they were send 26th of November.. so they might be here any day now.
i have no extensive experience coding the arduino, but there are good tutorials to follow so i'll get started on that ASAP.