Welcome to IIS George
Looks like you're off to a flying start, your stars are nicely round so you're already doing better than me.
Was it a single 5 min exposure or multiple subs, any dark frames taken?
Looking good for 5 mins worth, adding more time will remove that graininess but already some nice detail coming through.
The blue should be a little greener perhaps, Teal I think they call it but colour names are secret womens business so I won't say any more.
Great work, keep at it.
Justin.