Sample noob.. (Sampling your own sounds in key)

Hi,

I have been makin music for long time.. But with sampling I am new.. My question is when sampling your own sounds to play chromatically across the keyboard does it work like this -

You sample the sound and then place the sound on root note C3 and it becomes c? And then you stretch it out across your sampler for example kontakt and it works all the notes in right key?

Or do you have to find the key of the sampled sound then transpose it to c3 then place on c3? Is there any video tutorials to help me with this process I am really interested to make sampled sounds i can play chromatically from the voice and from objects around the house.

Any help welcome

thanks you