Small business networking setup

Hi all,

Doing a setup for a business and am a bit confused on how best to do this.

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Dsl is all they have to work with in the area and currently running a modem router combo to use voip office phones, a file server and wifi. There is a wifi booster on upper floor but it uses a different ssid than the main unit.

I need to bridge the lan to a building behind the main building about 50feet away and I ordered a ubiquiti nanostation to mount on the outside to connect wirelessly to the main network and drop ethernet to a control panel on a kiln. The idea is to be able to read data off the kiln from the main network.

What am I missing with the general networking setup inside/ will the nanostation solution work ok?

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Thanks in advance