Well, let's see...
- You will have to know the regulation of your country for radio communications and the bands that are free to use along with themaximun power you can radiate. With that information you can deside on a technology to use. Most countries allow IEEE 802.11 so i think this is the way to go.
- Need to know the distance of the point to interconnect and the environment condiction of the region, this will help you calculate the power you will have to use to transmit for a certain data rate.
- You will need to have LoS (Line of Sight) between the 2 points, so probably you will be needing towers to set up your antennas.
- You will be needing directive antennas wich will help you get more power concentration for the transmition, so you will ahve to point those antennas at each other, this could be kinda tricky.
- Read some access point specifications, like configuring, security protocols, access methods, QoS for wireless networks.
- Read about Freznel zones... this is just theory, it's helpfull.
Cisco is a good place to get documentation, also you coud try something cheaper like Linksys or D-Link... the theory is the same for all of them, thought Cisco tend to make things a little more complicate.
Also you will have to know something about switches, UPS and how to generate the electricity for the access points... I think tha's pretty much what you will have to know...
I was forgeting about the phisical protection of the equipment, like NEMA boxes, lightning stoppers, goos grounding, locked to prevent them from stealing...
Now, about organizations that could help you... well, most countries have help for people who wants to implement rural communications, at least that's the way it works in my country, it's the Telecommunication Ministry of Perú, a goverment office... I really have no idea how it would be in your country...
Hope ot helped.