Question when trying to use nftool

I am trying to do an analysis on monitoring of tool conditions. I have collected the tool vibrations and tool forces datas for my inputs. My weight wil be 0 (bad) to 1 (good).

Inputs vibration = -20, -30, -40, -50. feed force = 900, 1250, 1600. radial force = 150, 375, 600. axial force = 200, 450, 700.

1. Is my input for nftool this way? Input = [-20, -30, -40, -50; 900, 1250, 1600; 150, 375, 600; 200, 450, 700]; Since i was told input can have different elements but the system show error:Dimensions of matrices being concatenated are not consistent.

2. To obtain just one output, how do i define my target? I am confuse with the matrix as i cant put a 1x1 matrix target from the 4x3 matrix input. So if i have no output data, will the nftool give me an output and how i define it?

3. I got confuse when reading the manual defining of the weight and bias. What is the default weight and bias?

4. Instead of manual defining the weight and bias, can i multiple the weights straight to each of the inputs before inputing them into the nftool?

Thank you.

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Any kind souls in Singapore who i can look for, to get help for my neural network?