Regarding the E-Stop/switches, these are almost all modular so you can add different switch blocks as need. Yes, most simple E-Stops are NC, as there purpose is to break the circuit/power. They come in lots of configurations, many of the 30mm have multiple switch blocks in their basic configuration. I like most of the 22mm Automation Direct switches, the only ones that are somewhat weak (lens button breaks) are their E-Stops, so recommend the Idec 22mm or other brand (or get some extra lens for a few dollars). They sell additional switch blocks for their switches, just be aware of the total depth of the switch when buying an enclosure (lighted switches are ~3" in depth). The Idec E-Stop listed below is what I use in my lathe, it comes with a NC and NO. It also has a 24V LED (AC/DC) which can be wired separately, I use it as a power indicator. Below is an example of some basic switches/parts for a build, but type/color/configuration will change by build/costs. Most of my builds these days uses a separate small power supply to drive a main power latching relay and direction relays. I just did a build for someone with the same VFD, he did not have a spindle switch and this VFD does not have maintained direction inputs that work off of momentary switches.
I use the same pot in many builds that Jim recommends, works well and is "reasonable" for the build quality.
So I assume you have no spindle switch and you want to use momentary push button switches for direction and stop. If so, you need to add latching relays to sustain direction when using this VFD. I would look at this build as an example of ideas.
http://www.hobby-machinist.com/threads/acer-trump-1236-vfd-conversion.32910/
If you have a basic idea of control type, location and what you want them to do, I can probably put a wiring schematic together that you can use as a starting point. I have a number of these in different configurations, kind of a PTA as every build has a different set of configurations/VFDs.