Accuracy is the first and foremost skill
proficiency in transcription
Software experiences like the PowerPoint, Access, Open Office
MS Office, MS Word, MS Excel is a must
Technology and Computer skills including short cut techniques
Confidentiality and Multi-tasking ability
People Soft and report generation
Fast typing skill, 10-Key or alpha numeric or traditional typing speed with zero errors
Acquaintances with the Quick-books and Google Analytics
Concentration power on detailing
Years of experiences regarding leads
Assurance of availability and power of handling complex methods
Capability of understanding and persuading the online market
Superb basic knowledge in Grammar, spelling correction and punctuation
All the above skills need experiences to earn properly. And if you are newbie, then do not lie. Just be honest and try to find job with hard labor guarantee.
Do not ever think of copy paste while writing up a proposal.
Avoid impersonal and unprofessionalism. Be pragmatic and enthusiastic associated with your job in the proposal and show how much interested and worth you are for the job.
Do not beat around the bush rather enter straight to the point and show your knowledge related to the work.
Again, do not take too long to express your expertise. It should be time consuming, keep that in mind. There are thousands of proposals like yours the client has to read so do not kill his time by explaining things elaborately.