ok this is what we did when we sold our house last year
1. declutter and deposonalise the whole house
Put away all the photos on the walls, your DD toys that are around, any personal knick knacks, etc
clear away DVD's, books that are on display. You dont want anything personal left out as you want people to imagine their stuff in your house- not yours
also you dont want to have people touching your stuff- and they will!!!

Go through your copboards and pack away things you wont need for a bit. We packed up half our kitchen utencils, pots etc, half our blankets/bedding and even half the kids toys that we hid in copboards etc.
You dont want them thinking that their stuff isnt going to fit. and less in the cupboard does look tidier
Literally anything you are not going to use for the next few months- get rid of.

Also make sure all basic maintenance is done- taps dont leak, cracks filled in, painting finished, lights all working, walls wiped over, cobwebs gone, mulch is renewed. Cheap to do but make a place finished

Clean or get clean- windows, ceilings, vents, light fittings, chuck some domestos down your drains so they dont smell (domestos makes kitchen sinks sparkle too), also gurnery concrete and paths and if you can , give your bricks a bit of a wipe over to remove dust etc.

On OFI days- i took everything personal that we use out of the house or put away- put away alarm/ beside clocks, kids teddys, even favourite blankets etc. We had bed pillows that we didnt sleep on, but just came out and were put on our beds for OFI days. Get rid of any washing etc. pet stuff/bowls etc. Also new towells out (we had a set for OFI days only too )

We also would put fresh flowers around the house, brew some coffee or bake a cake so the smell is through the house and even put essential oil in the water i mopped with and on a tissue i vacuumed up so the place smelt yumm

Our Real estate agent had an interior design company come out and help us as well. What coloured towells to use. What vases etc . Things to enhance the appeal of the house.
For us this stuff was important to do- if you took away all the shine, flowers etc you were left with a old house that needed a new kitchen, laundry and roof. So we had to really sell the house on impressions and how it felt for people. and that is what happenend. After 4 months on the market- someone came and fell in love with the feel of the place and that is why they bought it!
I went and looked inside over 150 houses before we found our house. Things that i just couldnt get over and past and put me off a house were houses that felt cluttered, musty, and not looked after. A house that looks bright, airy, spacious (even if it isnt size wise) and looked after was what appealed to me.
HTH and holla if you want anymore info
good luck!