Here is a quick list you need to get your rooms started:
Preparing the room for painting
Before you get your paint roller, remove all the fixtures from the walls which will include picture, picture hooks and light switch covers. To protect your furniture from possible paint splat, remove them out from the room first. If it is impossible to have them completely removed, you can place them in the centre of the room. If the room has less stuff inside it will be easier to paint even those tricky corners.
Cover the floor any remaining furniture with drop cloths. If you have carpet, place plastic drop cloths as this can also act as a waterproof seal that is more effective than cotton.
Once the floor and furniture are secured, you will need to wash the walls with soapy water. You will need to remove dust and dirt to ensure that the paint will stick faster. Do not forget to rinse the walls with clean water to remove traces of soap.
Inspect the walls for damage, bumps and flaking paint. Make sure to fix this first by scraping the area and sanding the surface to create that smooth surface. You may have to use acrylic gap sealant if the wall is damaged and needed fixing. Once everything is done and prepared, then you can start the process of painting.