It's very important to ensure your stitches (if you've had any) don't become infected. Your midwife will visit you and check your stitches for you. I recommend having lots of warm baths, in fact a warm bath is good for most of the after effects of birth. Don't put any bath bombs or bubble bath in. Some midwives recommend salt baths or adding some lavender oil to help the healing process. Make sure you gentle pat dry the stitches with a towel. It's important to keep the area clean and dry. Another remedy for all the bruising is arnica. It is a natural aid for bruising and can be bought at your local pharmacy.
Keep taking pain killers as often as required even if breastfeeding. My midwife said to take both ibuprofen and paracetamol every 4 hours or so. It will seem like a lot but slowly you will soon need them less and less. It really takes the edge off at night and helps you get a little sleep. Sleep in itself it so important for new mums. You need to be on top form to take care of a new born baby. Check out my post on co-sleeping (Sleeping lions) as I think it can be key if you are struggling to get sleep with a newborn.
If sitting down is very sore a blow up ring cushion can ease the pain, especially if you have visitors round. If you are exclusively breast feeding then try a laying down feed position. This position means you can lay in bed, much more comfortable.
The most important thing to remember is that you will feel better and the pain will ease. I remember feeling like the pain and discomfort would never end but by two weeks I was sitting down and no longer taking any pain relief. You will soon begin to fully enjoy motherhood and caring for your baby.