Harro, fwiw II started life as a motor mechanic
. If I were you I'd go to Bunnings and buy a Kinchrome 3/8 drive socket set which will have both metric & imperial (i.e. s.a.e.).
Try to get a set with not only normal length sockets but deep (about triple length) sockets too.
And, you might consider a 1/2 drive set as well.
Pm me if you want more info.
The two best brands of professional tools are Stahlwille & the american brand Snap-On. But you need neither.
Imo Kinchrome are next on the ladder, not suggesting at all that Stanley are rubbish.
And in Bunnings you'll find combination socket set which also have ring/open end spanners in the box also.