There are two shapes recommended by the RHS here for your tree. They sound much the same and should give an idea of the long term goal.
- Pyramid or Spindelbush: These are small, neat cone-shaped trees, about 2-2.4m (6½-8ft) tall, with branches starting about 60cm (2ft) from the ground
This fall you should prune to these guidelines from here:
Dwarf apple trees are normally grown to a central leader system. ... If the tree has lots of side branches (feathers) cut the leader back to 8" (20 cm) above the top branch.
- Remove any branches closer to the ground than 20" (50 cm). Aim to develop a framework of well spaced branches that are capable of bearing crops without breaking.
- In subsequent years, switch from heading to thinning cuts.
- Cut out entire shoots that are crowded or crossing into the centre of the tree.
- Narrow angled crotches should be avoided as these are sources of weaknesses
- As the tree starts to bear fruit, prune for convenience in picking, spraying, and to allow light to enter all parts of the tree.
As well you have also got various advice about staking. A quote from the same reference helped me understand what to do:
All apple trees on dwarf rootstock will require support. The trees are
very small with thin wood. The fruit produced is of normal size. A
full crop of apples on a small tree is a heavy weight to support.
Branches can break off. The root system is shallow and trees may fall
over. The most common form of support is to pound a 2 inch diameter
post (5cm) into the ground beside the tree. The trunk and branches are
tied to this support post.
So you need at least three stakes as indicated in my other answer but the stakes also act to support the fruit laden branches which you would not do in a normal tree.
Also please review the answer to your related question here as I have added some more information.
This video may assist if you are a visual person but keep in mind it is for the North American climate and some details may differ.