What essentials would you recommenend in a tool.

What type of tool kit? One to carry on car or one to do DIY activities?

First you'll need metric wrenches, sockets end aand box end. Ball pein hammer, screwdrivers, oil drain pan, and papertowels. You get good one for around $2 a roll that if they get like water can be dried out and reused. Auto scanners normally run around$125 for a decent one, but it will only read engine codes and nothing else, not abs nor trans, those run about $2000-5000 some in the cheaper range will read abs codes. You could also buy a decent digital volt/ohm meter fluke are the best but more expensive.

Most auto parts int eh u.S. Here sell actron they are ok