Employment Offer Letter Instructions. Need help drafting a job offer letter?In Virginia, offer letters are usually enough. This letter confirms our verbal, contingent offer of part-time temporary employment. Simply complete the Employment Offer Letter form below and click View Results to see your completed contract. Learn what to include in a job offer letter and use our ready made template. Offer letters include a multitude of different pieces of information, including the job title and description, the job type, salary, and more. An employer may make a job offer through a phone call or email text. Get a federal employer identification number from the IRS. Fairfax County, Virginia - The following information will assist you in applying for jobs with Fairfax County.