Expect to need a CX size tool post if it doesn't come with it. You can get name brand ones new but the starter kits are ~$1500. You can buy Chinese knock-offs for less, but ymmv. Used one's come up at auction quite often along with tool holders. Yakisawa is still in business and still sells parts for the lathe but are generally expensive. Also verify you get a chuck, steady and follow rest.. If it doesn't come with one they can be spendy to acquire. This lathe uses change gears to select various threading pitch, if they don't come with it you'll need to buy them too.
Check out the lathe before you buy it. Stick the business end of a test indicator in the nose of the spindle and give it a spin to make sure it runs true. Feel for and listen for bearing noise on the spindle since these are the expensive ones (P5 class). Use an indicator on the cross slide to look for excessive way and screw wear in the sweet spot vs extremes of travel.
Does the motor work and sound good..?
The ways are tough to gauge w/o long straight edges so you'll have to do it visually to see if they were at least cared for (as you would for the machine in general).. Is there rust, are the wipers intact, is there fresh oil on them, are they clean all over or burried in sticky sludge and chips.