Its a great idea to create a mood board which is made easy with websites such as Pinterset and Houzz, or simply go old school and cut your favourite images from magazines. Having these details visually recorded will make it easier to convey your vision to others. Its always good to start with a neutral base, such as white, grey or a beige and build up with other textures and colours from that.
There are many trends that are popular including; Scandinavian, Country cottage, Cape Cod/Coastal, Modern, Minimalist, Retro, Vintage, Eclectic to name a few. The days of having matching sets of furniture for rooms are over. Mix up your furniture with modern and vintage pieces. I have a few pieces of furniture in my own collection that have been passed down from my Grandparents or owned by family of friends. Having these pieces in my house are a lovely reminder of friends and family or places.
Who are you renovating for? Is this your forever house or are you renovating to sell at some point? Be careful when using fixtures and fittings that are on trend. If you are considering using a copper light fitting, or black tap, perhaps a better option would be to use freestanding lighting or soft furnishings that can be easily removed or replaced when it comes time to sell or update the look. Bowls and vases are much cheaper and easier to replace and update than ripping out those tiles. Also keep in mind the overall feel that you wish to achieve in the house. Are you keeping period features or do you want to go for a more modern streamlined look?
When you are shopping for finishes make sure that you take dimensions of the space with you so that you can get accurate prices. Take your other samples with you so that you can put everything side by side to check it is cohesive. A trick of the trade is to look at your products in natural light as artificial light can change the colour.
Remember, don't put all of your ideas in one space, if it is feeling overdone, pare it back. Most importantly surround yourself with the things you love.
"Have nothing in your house that you do not know to be useful, or believe to be beautiful" William Morris