PPL skills add-ons

Hi Guys,

As a newly licenced GA PPL I was wondering what this group's views
were on how much general flying would be appropriate before I think
about training for any endorsements or ratings?

Obviously I need higher skills to get something like a night rating,
and would (say) 50 hrs of weekend navs be advantageous?

I would be getting the added skills to improve my flying, and because
it's fun.

Richard.