customer testimonials but it must be real you can also do local marketing, unlike online you advertise it more on web, social media and etc while local marketing you need to advertise it locally like putting stickers, free ads papers on streets
I saw your site yesterday, and I agree with previous posts, add logo, address and phone number. If I'm the buyer this is one thing that I'll consider whether the site is trusted or not.
Invest in SSL, develop how the website works, improve. Be persistent! Visitors to your website perhabst doesnt purchase anything today but next week or next month. Promote your website to get more traffic
You can make people trust your site by displaying logos in appropriate place. Like 'secured by SSL' 'click to verify' 'visa passcode approved' (or is it 'verified by visa') etc and so on and so forth.