2. Read snYpir's Briefing tutorial and also see the working example in the Tutorial Mission, both in the Ed Depot - Tutes - Getting started. You should become familiar with all of the tutorials in that section: there is some overlap so you don't need to study every one intimately, but you should skim through all of all of them so that at least you know what is there. It will save much time and even more heartache.
1. Use a variable. For example:-
First trigger
Activation: as you like
On Activation: trig1=true
Second trigger
Activation: as you like
Condition: this and trig1
On Activation: as you like