PGA pros do this already, any pro attached to a club shop is basically compelled to stock the brands we all know, there are literally thousand of these guys doing this, so starting an online version would not be wise.
Setting up a traditional BandM store with the usual brands costs a fortune and commits you to buying big amounts each year the same applies to the OEMs minimum order levels.
Avoid doing what thousands of others already do and you are half way there.
MOST guys rush to stock TM, Nike, Callaway, then have to turn over product at zero margin or a loss to make way for new models
AVOID, clothing like the plague
Sky BLUE
Navy Blue
blue
Dark Blue
Light Blue
Ocean Blue
shirts in
xs
s
m
l
ml
l
xl
xxl
Hi, mate you get any in red?
Making money in golf is actually easy, golfers will buy pretty much anything and they spend a lot of money, the problem is most people think they need to sell TM, CALLAWAY etc there are already WAY TOO MANY doing this, joining this parade would be tough!