Do you have line of sight and clear visibility? If so, then there are a couple of ways, one is free and one requires some expensive hardware.
For the free method, you need a compas, declinometer (consturction equipment, at Lowes or Home Depot), and Google Earth is a plus (or a handheld GPS unit). Capture GPS and elevation, etc. From there you can calculate with google earth or your GPS coordinate headings (X degrees + or - from due north). If one site is above or below the other you also need to account for uptilt or downtilt on each end. Once close you can have a partner on the other end make small changes in heading and log in to the MST200s to monitor SNR/RSSI, make a small change, monitor for a minute to see if it improves or not, etc. Will take trial and error.
For the expensive method, you can buy/build special laser alignment tools, there's lots of examples on the internet.
Throughput at 2km should be approx 40Mbps HT20, or 60-70Mbps HT40, depending on how you deploy (L2 or L3).