Services discussion is the right place to be but frankly speaking a newbie account wont helped you be trustworthy but if you will vouchs your services or skills that you have let them try to a high ranking member and trustworthy with the green trust in the profile that will comment on your service after. It wont be complicated if you will provide your heart out confidence on that matter.
Agreed, trust is much important to promote your service and get good business. In specific with a newbie account making an trade or rendering a service usually gives a negative feel among the users, though you were doing the service with legitimacy.