I need help with some HW from an Astronomic Observations lecture. I am required to plot the color-magnitude diagram of 2

[answerhappygod]

I need help with some HW from an Astronomic Observations
lecture. I am required to plot the color-magnitude diagram of 2
globular clusters of my choice with python, using catalogs from
VizieR or ESO. Then perform isochrone fitting on one of them to
estimate the age of the globular cluster.
I have no experience whatsoever with using these tools, and I
would really appreciate it if someone could tell me how to do so
and recommend which catalogs to use...
Someone left a comment regarding data, the problem is that the
HW requires for me to find whatever data is needed from VizieR or
ESO etc... I am unclear on what data to use at all.