Selecting the apple cultivar you want is an important step. Do consider chilling hours, but also disease resistance (scab, rust, fireblight, powdery mildew, etc.), and qualities of the fruit, as some apples are preferred either for baking or eating fresh.
The cultivar of the rootstock is as important as the scion. Some rootstocks will dwarf or semi-dwarf the scion which may be an advantage to you as size is your first concern. Also some rootstocks are adapted for light, sandy soils and other s for heavier clay soils. Know your soil and choose accordingly.
There are a number of other options to consider such as espalier and multi-cultivar grafts that will allow you to grow several varieties from a single trunk.
Also ornamental edible plants are a growing trend; some apples today are bred for red flowers and fall color. These cultivars sometimes also have apples with red flesh.
When you are ready to plant choose a full sun location with good drainage. Plant on at least a slight mound and keep the graft union exposed. Mulch around the young tree. Water deeply but infrequently . With each passing year more deeply, but less frequently.
