Found some interesting article in Forbes by Martin Zwilling «How To Delegate More Effectively In Your Business«. And I want to add something useful tips.
«Principes of ladders» — this is one of the most popular and effective (and simple) principles of delegation some work. Main idea — you stay employee on one step and do next step together.
Start with first steps and go down. If your candidate can do 80% are more of this work you can delegating this.
And if you think «if you want something done — do it yourself», you are a bad boss.