There are many types of keyboard stands on the market including the "X" frame and "A" frame models. Most of them are collapsible and thereby form a much smaller footprint which can be easily transported.
The "A" frame stand - so called because the ends of the stand emulate the letter "A" probably has the greatest capacity, with up to four tiers available on the better models. "A" frame stands are usually made from tubular steel and although they are relatively simple to assemble they will generally take longer to do so than the X-type stand.
The X-type stand is so-called because it is formed by two pieces of cross braced metal that form the letter X when assembled. This is a much more simple design and can be assembled in a matter of seconds. It can easily support two keyboards, but cannot match the capacity as the "A" frame.
Essential Accessories
Keyboard accessories will vary according to what style of keyboard you may have and also how your keyboard is used. Assuming that your keyboard is transportable and that you may be using it for public performances, then the first two things to consider are a gig bag (or flight case) and keyboard stand.
The gig-bag or hard case will protect the instrument in transit and provide a means of storage when not in use. A secondary consideration is a keyboard stand to allow a comfortable playing stance, however if you prefer to play your keyboard when sat down, then you'll need to think about a suitable stool or chair - again you should ensure that it allows you to be comfortable when playing.
Other accessories include a damper/sustain pedal for dynamic expression and also a volume or expression pedal for level adjustment during the performance. If your keyboard is likely to be connected to other sound modules or keyboards via MIDI then you may wish to contemplate a MIDI patch bay or switchbox along with all of the relevant 5 Pin DIN MIDI cables.