Oncidiums are a bright light orchid they will want a south or west facing window, but they will burn in direct sunlight. You may get them to grow in an east window and place them in a south window in the fall to promote flowering.
Plant them in sphagnum moss and orchids will never give you any trouble. Water this one when the top is very dry. The pseudo bulb will wrinkle if you water it too little so keep an eye on it. If your home is very humid or you keep this plant in a bathroom or kitchen you might plant it in bark instead. It just depends on the conditions in your home.
Like all orchids they want a significant temperature drop between day and night to signal blooming. You can put them in a drafty location or put them outdoors in the summer.
Remember if you put them outside put them under a tree. They will not survive direct outdoor sunlight.