Hey guys! I have a laptop and I can upgrade to Traktor Pro 4 for not too much.
If I purchased a controller like the new X1 mk3, what else would I need to start? A set of speakers (what do most beginners use)? A pair of headphones I imagine?
X1 Mk3 is essentially only a deck controller. It is possible to control Traktors software mixer with it but wouldn‘t call it comfortable.
Additional to speakers and headphones you definitely need an audio interface. If you are set to X1 Mk3 I would suggest to add a Z1 Mk2. It features an audio interface and mixer controls.
If X1 Mk3 isn‘t set from start: I suggest to get an all-in-one controller like S2 Mk3, S3 or S4 Mk3.
