Your CV will be as long as it needs to be. If you have lots of experience you’ll have more to tell, just don’t miss anything off or leave any unexplained gaps in time.
Within reason, go for whatever style you like – as long as its clear, easy to read and logical. A white background is easier to read than a coloured one.
If you are actively seeking a new role and want recruiters to find you on Linked-In or other CV sources, remember to use plenty of key words so that you come up in the right searches.
You can change your CV to highlight relevant skills and experience for each individual job application. Make sure your CV clearly shows a potential employer that you are the right person for their vacancy
Your overall aim is to make your CV as clear and reader-friendly as possible. The person reading your CV may well just scan read it to pick up key points and experience.