Oh dear, it's so hard to visualise a garden before it's there! It really isn't complicated; it's just that there are as many different gardens as there are people and plants come in all shapes and sizes.
Have a good think about what you want to garden to do for you. So far you would like:
something tall and slender to give privacy
a fruit tree or two
somewhere for your fruit bushes
a wild flower meadow
Am I anywhere near the mark?
Fruit trees come in two parts.
There's the bit that goes under the ground which is the 'rootstock'. This bit determines how big your tree will grow.
The rootstock is grafted onto the trunk, usually a few inches above the ground. The top part of the tree will be the type of fruit you would like.
So you can have. for example, a Cox's apple on a dwarfing rootstock so it'll grow to about 6 feet or an ordinary one that'll grow to 15 feet or more.
When you plant your tree just remember to keep the bit where the two parts are joined together above the ground.
Don't despair - keep asking the questions and somehow we'll get there - lots of people on here know a great deal about gardening.