Use Colour Wow (powder root cover) to disguise the roots you can see, hairline and parting.
Using box dyes that contain metalic salts may affect your next hair salon colouring service.
Fringe trimming comb the hair down from the middle of your head and place inbetween your fingers. Rest your fingers on the bridge of your nose and cut below your fingers. Cut longer fringes if you like but follow the same process. Keep the hair flat to the face when cutting.
The above method will ensure you pull the sides of the fringe into the middle of your cutting area and the sides of the fringe will not get too short.
Condition your hair weekly, put conditioner onto damp hair and leave for 10 mins to start with and build up to half an hour gradually if no itching or adverse reactions from your scalp occur.
This will condition your hair whilst you wait to get it cut and it will stay healthy.