Please help me to correct these sentences

[JRD]

Dear Sir,
We are a well established advertising company in the region. We are working in this field since [year]. We would like to inform you that we have now got a unique opportunity to serve you in the advertisement filed which would hep you to improve your business never before.
Your advertisement will be displayed on our LCD panel which is located at each counter at the Metro stations from xxxx to xxx
We, M/S xxxx can only do this work as awarded by our Metro Department. Kindly note that the spaces are limited so please place your order at the earliest.
All orders will be treated based on first come first service so do not wait till the end and fetch this rare opportunity to make your business wonderful.

Awaiting your valuable order



In case of any clarification, please feel free to contact undersigned.
[SIZE=+0][/SIZE]

 

[e2e4]

/A learner/

Dear Sir,
We are a regional well-established advertising company. We've been working in this field since [year]. We would like to inform you that we have now got a unique opportunity to serve you in the advertisement filed which would help you improve your business as never before.
Your advertisement will be displayed on our LCD panels which are located at every counter at the Metro stations from xxxx to xxx.
M/S xxxx is a company that is authorised by the Metro Department. Kindly note that the spaces are limited so please place your order at the earliest.
All orders will be treated by way of "first come - first service" so do not wait till the end but get this rare opportunity to make your business successful.

Awaiting your valuable order

In case of any clarification, please feel free to contact the undersigned.

As, is.:-|

 

[billmcd]

A few suggestions:

Dear Sir,

We are a well established advertising company in the region. We [STRIKE]are[/STRIKE] have been working in this field since [year]. We would like to inform you that we [STRIKE]have now got [/STRIKE]now have a unique opportunity to serve you in the [STRIKE]advertisement[/STRIKE] [STRIKE]filed[/STRIKE]field of commercial advertising which [STRIKE]would[/STRIKE]could [STRIKE]hep[/STRIKE]help you [STRIKE]to[/STRIKE] improve your business as never before.
Your advertisement [STRIKE]will[/STRIKE]would be displayed on our LCD panel which is located at each counter [STRIKE]at[/STRIKE]in the Metro stations from xxxx to xxx
We, M/S xxxx can only do this work as awarded by our Metro Department. Kindly note that [STRIKE]the[/STRIKE] spaces are limited, so please place your order at the earliest.
All orders will be [STRIKE]treated based [/STRIKE] processed on a first come, first [STRIKE]service[/STRIKE]served basis so do not wait till [STRIKE]the[/STRIKE] [STRIKE]end[/STRIKE]all spaces have been reserved to take advantage of this rare opportunity to make your business [STRIKE]wonderful[/STRIKE]thrive.

Awaiting your valuable order



If you need more information, please feel free to contact undersigned.