Yay herf!
For me oncidiums are very easy to grow! but then I can't grow a phal so different strokes I guess
But I find them to be very unfussy!
small grade bark mix that drains well- med light water when the medium is almost dry (mine have done well with weekly watering, but thats my conditions - more in hot dry weather)
fert weakly weekly - but flush pot once a month - oncidiums seem to be more sensitive to mineral salt build up as they have thinner foliage.
post pix of your new baby please?