Quick reply from a Helpx host... ( www.helpx.net )
As a host I like the following in a Helper profile:
A full profile on the Helpx site as this shows some committment at the start
A photo - preferably looking at the camera and smiling
Details of your motivation and interests and where you might like to help (country, duration of stay, etc.)
Your special skills
Your past travel or work experiences
Something about you that makes me think you might be good company... a little about what you enjoy I guess
When a helper makes contact:
Try not to ask questions that are answered in the Host profile
Tell me why you liked the sound of my place (and not just because you think we live a wonderful life and you'd like to share it!)
Indicate some enthusiasm for the projects mentioned in the host profile
Give an indication of the ideal dates you'd like to stay and your degree of flexibility
Offer to send more info or to
answer further questions if required. (And poss offer references.)
However even the little I've read above suggests to me that you'd make a great helper.... Good luck and Happy Travelling!