Most cost efficiant ways to make a home more valuable while living there?

I live in a fairly spacious two bed, two bath, upstairs condo with a porch, but plan on having another kid in a few years so I will need to be able to sell this place, and I would love to both make it a better experience while I'm here, and worth more money. Currently, I have light baise-ish carpets in the bedrooms and living room and up the stairs, linoleum floors, stark white cabinets that look unfinished (I need to ad hardware, thats cheap enough) double sinks in the bathroom with a large mirror and no room for cabinets/storage, no shelving in the to-small laundry room, and ugly light fictures/fans all around. One thing I KNOW I'm doing is getting film to put over the windows to block UV and lower utility costs, but other then that which things will I be able to do while still here, which will reap the most profit, and which wont make much difference? Thank you