Just call the listing agent and tell her you want to put in an offer and you don't have a buyers agent. She will represent you and can likely give you very valuable feedback about what a ``competitive'' offer would be.
Be persuasive, be personal, be specific—but don't be too pushy. Expressing appreciation and hope is fine, but don't beg or make demands. And don't lay the emotion on too thick—sellers may resent feeling like they're being manipulated.
Structuring the Letter Introduction. Start with the purpose of your letter - your land is for sale and you're notifying nearby landowners. Description. Include a brief description with what you know about the land. Include an Image. They say a picture's worth a thousand words, which holds here. Contact Info.