How to get a smooth painted finish on soft wood.?

I'm using standard 2x2 and 2x4 wood for a chair base. What is the best way to fill the surface to get a nice glossy painted finish?How to get a smooth painted finish on soft wood.?
Kappa has a good answer, although I might add some recommendations. In addition to what Kappa said about the quality of the paintbrush having a lot to do with the quality/smoothness of the finish (which is very true) and the suggestion about filling the holes, I would suggest : 1. prime the wood first, this will make sure that the moisture or any remaining sap in the wood does not bleed through the top coat of paint ( an oil primer is best for this). 2. use an oil based paint for the absolute best finish, oil paint has the best ';leveling'; (smooths out as it dries) properties especially when using a semigloss or gloss finish. You can certainly use latex paint and will most likely be happy with the result since latex paints have been vastly improved over the years. However, nothing levels out to a smooth finish like oil! If you have any other questions you need answered, please feel free to visit my site at http://thepaintprofessional.com/How to get a smooth painted finish on soft wood.?
Wood filler and sanded when dry with a fine grit sand paper. Once sanded wipe of the area with a damp cloth or sponge to get the remaining dust off the wood (repeat on wait till dry). Finally the paint finish has a lot to do with the paint brush...the better the brush (the more expensive) the better the stroke (consult the paint dept for a suggested fine brush). After you have bought your brush just make sure you have an even amount distributed on the brush and really take your time on the strokes...no need to be in a hurry.
use a thick paint, don,t wipe the brush off flow the paint on


brush on in a one way stroke


let it dry give it another coat
Is this fur? If it is good luck with getting a smooth finish. This is why fur is hidden between walls (studs) not on walls or in furniture. If this is for a play room or outside it will work.