The unusual design of the Proxxon PD 230 lathe leaves few options for any of the more commonly available QCTP quick change toolposts.
There is very little space available in the dsign for adapting a common QCTP, since having a dovetail to match the base of the top/compound slide is required, so it's not likely that it will be easy to design a QCTP which will utilize the rotational position feature common to most types of QCTPs. Also, the feed screw of the top slide is fitted in a way that maintaining a feed screw feature almost demands the supplied toolpost or the Proxxon QCTP.. however the Prox model still doesn't rotate except by unlocking and rotating the top slide.
I think you'll find that the supplied toolpost is adequate for most operations you'll end up wanting to do. The supplied TP appears to be capable of 2-way cutting tool mounting, at least, so that's a definite advantage. As with most lathe work (and many other tasks), planning out the sequence of required events/steps is what makes the most practical use of one's time. Generally, the ability to plan these "time saving" steps effectively, comes with experience.
On other lathes which can utilize commonly available and easy to install QCTPs, they are merely luxury conveniences. They have several good features which make tool changes convenient, but as someone mentioned, lathes with more primitive tool holders have been used successfully for generations without QCTPs. In addition to making many of the machines and weapons for 2 world wars, manual lathes and rigid or lantern toolposts were used to advance every type of technological progress which took place since the first lathe was produced.
As a beginning lathe user, it may be very useful to start with plastic stock to help you get accustomed to the various general aspects of cutting rotating material. Scraps of PVC pipe, empty pen bodies and various parts of items which will be discarded, should all be seen as potential parts now.. definitely good materials for practicing anyway.
A shallow chip tray/pan can be fabricated from any number of materials or unused products which you may have in a cupboard or closet, such as a baking pan for example. Many small lathes have features on the bottom to enable the owner to mount the base to a table or bench. Those features can be utilized to place block spacers between the base and a chip pan, where rubber feet/pads can be mounted to the bottom of the pan under the blocks to prevent sliding around during use.
When metal parts become a regular part of lathe use, you'll discover how easily chips attach themselves to clothing and shoes, which then transfer them to various other locations.. so try to set up a work table away from the busy traffic patterns within a household, and be aware of the parasitic characteristics and behaviors? of chips.
I'm not familiar with the design of the Prox lathe, but you may find it useful to have a hand crank for the spindle, if one can be attached on the left end of the spindle. Hand cranks are useful for certain operations, and I find them very handy for short threaded sections such as you may be contemplating for lens adapters. It's always the best practice to unplug a machine before installing something like a hand crank which is likely to cause machine damage or personal injury if the machine power is accidently turned on with an unbalanced spindle hand crank in place.
In addition to DoN's excellent recommendations made earlier, one lens type that I know of has inch-pitch threads, and those are C-mount video lenses, which are 1" 32 TPI.
A couple of other items needed for machine use would be some small brushes for cleaning away chips (compressed air can actually force chips into places on machines where thay may do harm), and an oiler with an oil suitable for your new machine. The manufacturer may recommend certain lubricating products for your machine, and indicate which parts need to be kept very clean, and lubricated.
Finally, I hope you get a great deal of enjoyment from your new machine.. I find metalworking projects to be very gratifying.