Work steps and required tradies

Hello all,

I have two doors in my house ( one standard and other sliding patio glass door). I want to close them up and maybe add a window in each. My questions are :

1. Considering its a 20 yrs old brick veneer house, what all trades do I need ? Carpenter etc?

2. What sort of budget am I looking? Labor and material ?

3. Where can I find these 20 yrs old red bricks?

4. Any recommendations on tradies in south brisbane ?

Thanks