2. Ask for their portfolio/employment history. Then ask for references for those projects/jobs. This will whittle down 90% of candidates as many don't have prior experience they can show, or any references.
3. Contract to hire. Give them a 2 week to 1 month shot at delivering results you like, and then hire them. Assumedly are not a huge company (sounds like you have no other similar role holders to interview the new recruits) so you don't need to take the responsibility of hiring people with the huge risk that comes with that. Give them a paid trial. Or depending on your state and risk tolerance, hire fast and fire fast.