Build order help

[Sagax]

So I've been played FA for about a month now, FAF for only a couple weeks maybe and I've come across the concept of build order. From what I can remember I've ended up using this build order for almost every match.

Commander qued commands:
Land Factory x1
Pgen x2
Mex x 2
Pgen x 3
Air Factory x 1

Qued units in Land Factory:
4x engineer
1x scout
4x tank
2x engineer
1x scout
4x tank
10000x engineer

First engineer gets the other two starting mexes and a then goes to grab some outer mexes and/or a hydro carbon.
Second engineer build rings of pgens around the factories
Third engineer grabs the rest of other mexes
Fourth spams land factorys

The only problem is my eco stalls before the game even hits the 2 minute mark, and from what I've read that seems to be very bad. I realise that I've been lacking to send any engineers to reclaim but in maps where there are only a clump of trees nearby is it worth it?

[Szakalot]

Watch this from 2:00 to appreciate tree reclaim : )

http://www.youtube.com/watch?v=2IhjuFY8t3w

[FireMessiah]

http://www.youtube.com/watch?v=u_m53YcP9OA

this link taught me loads about effective initial build orders.

also any close-by reclaim to grab early can be a godsend.