Originally Posted by J. V.
You are not in the US right. We don't use 5 amp breakers in residential. Maybe someone familiar with your country's requirements can assist you.
But yes you can install your lights and switches as long as you have the correct wire size for the breaker. I have no idea what a two way switch is? We have single pole switches, three way switches and four way switches. A single pole switch controls one or more loads from one switch. A three way switch controls from either switch and four way switches control from multiple locations.
We, the U.S., are one of the only countries in the world that calls a single pole double throw switch a three-way. Everywhere else, England, Australia, India, NZ, France, etc, it is called a two-way.