Good design isn't just the sake of beauty and beauty alone - eye candy. It's worked into us humans that we trust beautiful things and people more. If we compare the gorgeous site Montessorium to something like Lings Cars there is a huge difference in the quality of the design work, what one would you trust with your credit card?
Many of the users will have come onto your site to find out how much a service of product costs. Save yourself a lot of work and give them what they want. It will save you a lot of work with time waster too. Unless you have a special sales technique why wouldn't you show your prices? Give a range of pricing if your service is dynamic / differing.
It’s unlikely a small business will have worked with globally recognised brands but as your business grows its more than likely you will have recognised local companies as clients - show them!
Not only show them off but make a count of them “Trusted by 175 companies worldwide” - make even alone help make that sale.
If your the site in question has content dating back from 2009 as the latest entry what is your immediate thought? Something like are these guys still in business? AVOID. If you don’t have a blog, content can be fresh with a Twitter feed - think of it as your mini CMS. Update it at a absolute minimum of weekly, posting your local sports team results or news is reasonable start.
If you have ads on multiple other sites and mediums it really helps build trust and authority in your marketplace. Whilst this other advertising may not bring in a positive ROI it can certainly lead to trust in a round about way.
If you have been featured in a popular well known publication, naturally mention this. As seen on TV - hell yes - publicise that! Hard to track this - but ask people why they bought from you... If they had heard about you other than your website.
Your website loading speed is very important. Doubts will creep into your customers mind if its slow loading. If it’s really slow then people may never even see you at all - ever.
As Google is seen as such a powerhouse now, it’s important you are easily found and seen heavily on there. Google reviews help - also use these on your website. Make sure you show in local and map search. You want multiple listings when someone searches for you.
Good design is about making good choices. You wouldn't therefore want to include all these displayable elements in one page. You would spread them around your pages to increase credibility and trust in your website.