How will the paint be applied (brush, roll, spray)?

This depends entirely on the job at hand and on the finish that you want. Each method has its merits, for example:

Brush – Painting with a brush is often necessary when coating uneven surfaces, such as textured walls. We often use paintbrushes to finish areas that are difficult to reach.

Roll – For smooth surfaces, using a paint roller provides an even coating that results in a flawless and attractive finish. When done properly, it is also a highly efficient way to apply household paints.

Spray – Spray painting may be required to coat surfaces that even a brush cannot tackle effectively. Also, when a high-gloss, blemish-free finish is the goal, spray painting is the ideal method of application.