What I love about Peerless watercolor is how easy the colors blend together like the green and yellow areas on the photo above. Paper is so important too - my favorite is Canson #140 cold press. Ah yes.. and the perfect paint brush.. the holy grail of water color - for me it's the No. 8 brush. No matter who you ask you will get a different answer to all these questions - it's important to find what works best for you and to experiment with different products - don't give up!
Once you master the background you can layer on lots of pretty detail dies like this one from Poppystamps - the Susanna Blossom! I cut several from watercolor paper - and adhered them to the base. You need to be careful with your adhesive! If you use a liquid, like I do, you need to be aware that any leaks will reactivate your watercolors - so use it in moderation!
A simple sentiment lets the background do all the talking! Why not sit outside and paint a batch if the weather's fine? You'll be ready for anything just by adding a few die cut images!
Have a great day and happy crafting!