Home Improvement Questions? Ask a Handyman for Answers
2 coats of Kilz brand water based primer tinted the color you want, then on coat of premium quality latex finish coat in flat or semi gloss with a 10+ year weather rating.
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The wood should have been dried and cured before you used it (typically from a lumber yard)... if that was the case wait a month after the last rain when the weather is warm and sunny.
If you used green fresh cut lumber (that would be unusual) it should cure for 6 months and wait a month after the last rain. If you paint a bit sooner than that, and the surface is dry when you apply the primer, the paint will still last reasonably well.
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If you want to entirely sure, use an electronic wood moisture content tester and paint the wood when it is 12% water by weight.