See my post on speed strats for gathering resources in T1. All carbon would be my suggestion on low food maps. To recap the standard 8-9 min T2 time build order:
1. Que four workers in CC, set gather point on carbon until you locate food.
2. Build two prefabs with your three initial workers.
3. ctrl-1 your scout. Using about 6 waypoints (right clicking) send your scout on a circle of your base to locate resources and free food.
4. Find 3-6 banthas/nerfs, send to CC for butchering. 10-13 banthas/nerfs. 5 to CC for butchering, rest in nursery.
5. By this time, you should have worker #4 and #5 on carbon. Change gather point to slaughterd nerfs and banths.
6. Build workers continuously until pop of 12-13. Build cpc.
7. In T1 make sure to place most of your workers (at least 15) on food. Food is what you need to get through the tech levels fast.
8. By this time your free food (nerfs/banthas) are probably almost dead. Switch food collectors to carbon. Build fpc, start building some farms.
9. By about your third farm, choose to build ore or nova proc.
10. Workers #16-18 go to carbon. #19 and #20 go to carbon.
11. Continue taking carbon collectors and making farms. 7-9 is sufficient in T1 for constant worker production.
12. hit the T2 button around the 7 or 8 min mark.
Notes: I live and die by hotkeys. There is a post in the heavengames forum
http://swgb.heavengames.com/cgi-bin/forums/display.cgi?action=t&fn=4)
on hotkeys. Those are the ones I use.
In summary, make sure most workers go to food in T1. Food is what you need to get to T2. Here is my breakdown 10 food/farms, 6 carbon, 4 ore or nova (you will make this choice depending on what type of rush you are going to do).