You're coming up to speed on the basics; good!

Re: Bridging the pump relay. There are two sets of numbers involved; one set is for the socket (7&8), the other for the relay itself (either 15&87, or 30&87). When you remove the relay you will see that the pins are numbered (30,87,31,15, etc.); the socket is also numbered (1 thru 12). Since you will be inserting a jumper wire into the socket, the socket numbers are given, rather than the relay pin #s.

Yes, fuel flow is continuous, hence "CIS" (Continuous Injection System).

There are (in your case) six sets of upper chamber, lower chamber, and diaphragm; one set for each injector nozzle.

The IACV is a throttle plate bypass; measured air from under the air meter sensor plate is directed to the intake manifold/inlet ports to control idle speed independently of throttle position. Cold start fuel is injected at the point the bypassed air enters the manifold. Yes, the bypassed air serves all cylinders.