Here are the steps to build an interior wall:

1. Determine the location and size of the wall.
2. Lay out the wall stud locations.
3. Fasten the top plate to the ceiling.
4. Position and secure the bottom plate.
5. Install the wall studs.
6. Form the connections and corners.
7. Install insulation (if desired).
8. Install drywall or other wall covering material.

You will need basic carpentry skills, tools, and materials such as:
- 2×4 lumber for the framing
- Drywall or other wall covering material
- Nails and screws
- Hammer or drill
- Level
- Plumb bob
- Tape measure