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My father in law planted his cotton on twin days. Also how often do they occur, once a year? month?

I live in north London and have a small 20×20 garden – square shaped with beds on the edges. On part of these beds I put in daffodil and tulip bulbs last year and they are just starting to come up. I would like to have a pretty garden with flowers through out the year. I’d also like an apple tree to see apple blossoms – is it too late to plant one? This is my first house and first garden so I’m clue less.
How do I go about doing this – any help would be greatly appreciated.