Small shopify updates

Evening everyone,

I have nearly finished putting together my Shopify site (debut theme) but there are a few things I need help with please. I know some of these are v basic but I can't get the changes to work, so need some expert help!

1. Change text colour in header (no other titles)
2. Change button colour / text colour on add to cart and checkout buttons
3. Change text colour on continue shopping, remove and view cart links

Anyone free to do this tonight?

Thanks!