What to use? Nmos (pmos) transistors, or usual pnp (or npn) TTL type? Our choice is npn, since nmos and pmos transistors are not implemented (you can put them on breadboard, but can not apply simulation - not implemented yet). Easier way is to find solution with transistor gates
circuits to implement AND gate (Url of previous link is: http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/trangate.html).
We shall demonstrate implementation of NOR gate circuit on our breadboard, when implement RS latch (next step).