What tools & starter kit ?

 As a total newbie to this kind of stuff can you suggest some essential tools and a starter kit to help me get up to speed before starting on my first OEM kit.

I'm a Mech Eng with many years in IT mainly networks, but some coding. 

I have a temperature controlled soldering iron - solder sucker - cutters - pliers ...

I have plenty of networking stuff, crimping tools, wires etc.

Also building up a collection of dead electronics stuff for spare bits including failed boiler control boards from a plumbing friend.  So I can practice  soldering.

What other essential things do I need?

Can you recommend a starter kit?