Re: breastfeeding???
Congratulations on making it to age one! That's a terrific milestone and it's great that you're intending to nurse for at least another year. Toddler nursing is awesome. 
To answer your questions:
- As long as both you and baby are happy nursing, you cannot nurse too much. Breastmilk is good for your baby, and it's very normal for a young toddler to continue to be mostly breastfed.
- Whether or not you night-wean is up to you. It might help your LO sleep through, but it also might not. You still probably have a lot of teething to get through, and many kids don't STTN until they are much older, regardless of when they were night-weaned. If you're ready to night-wean, go for it! But don't feel like you have to, or that it's guaranteed to fix sleep issues.
- If your LO seems interested in solids for breakfast, feel free to offer them. You can follow your baby's lead on this one.
- If you reduce the amount of nursing you are doing, your milk supply will decrease. How much it decreases depends on how much you cut back. But don't worry that cutting back automatically results in your supply drying up. Weaning can be a very slow process, with milk supply decreasing very slowly and almost imperceptibly as baby gradually nurses less and less.
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"