A homemade latte begins with a practical choice: how much drink do you want, and how prominent should the coffee be? Choose a cup and an espresso dose together. Adding the same shot to increasingly large amounts of milk changes the result, even if every version is called a latte.
Prepare the espresso with a measured recipe, then steam fresh milk in an appropriate pitcher. Introduce enough air to create fine foam and keep the milk moving so that the texture becomes integrated rather than a stiff cap above hot liquid. Follow the machine's operating instructions, wipe and purge the steam wand as directed, and take care with hot surfaces and steam.
Pour the textured milk into the espresso and taste before adding syrup. Dairy milk and plant-based alternatives behave differently, so judge the product you actually use rather than assuming one steaming method fits every carton. Espresso also does not require a dark roast or a special species of bean. A lighter or darker coffee can work; the useful test is how its flavor combines with your chosen milk and drink size.
The conversation
A good question can make a better brew.