First stage for F-statistic

[Anbrhave]

Dear people,

I want to check whether my instrument has enough correlation with the endogenous regressor by looking at the F-statistic.
First I give the following command: ivreg grade workhours2 studyhours2 age lifeaway univers prevgrade motivation (workhours studyhours = nodisability unearninc) if stuyear==1

Then at the internet they said that for stata 10 (the one I use) I can do:
estat firststage

However, this does not work (stata gives : invalid subcommand firststage)

Is there a command that does work??

And if I just do it with reg, should I give the following command??
reg workhours nodisability unearninc grade workhours2 studyhours2 age lifeaway univers prevgrade motivation if stuyear==1

?? (It seems quite strange that workhours^2 is not intstrumented, is this wrong).

And the regression above gives F-statistics higher than 10, but is this enough to say the instrument is OK??

Thanks!