steps for painting pine

I built a couple of beams out of 1x8 pine boards that I will be putting in my kitchen. I am going to sand them and fill any knots with wood putty and then plain on painting them an off white color. I have some oil primer and oil paint from sherwin williams that I used on my cabinets that I would like to use on the beams. Is there anything special that I need to do for these pine boards for painting them and getting a good finish? Thanks