Welcome to the world of German armour, be prepared to have your head battered. That Tamiya kit is a nice one, its one of 5 Tiger I's i have in my stash. Tamiya armour kits are very nice, and go together very well. They are not as detailed as Dragon kits, but then they don't come with the same price tag and they don't send you to the funny farm, so stick to tamiya for now.
As far as Tiger's go, changes were made at the factories during its production run, sometimes on a monthly bases. This changes by themselves were often rather small, and did not warrant a new designation, or Ausfuehrung as the Germans termed it. We now use the terms Initial, Early, Middle and late, but the Germans did not use these. So, all Tiger I's were Ausf E.
As for paint, the Germans made a few changes during the war. When the Tiger first entered service, they were still useing all over Pz Grey. They in Feb 43 they switched to a 3 colour scheme. The yellow was applied at the factory. The troops in the field were supplied the other 2 colours in a paiste form. This could be thinned with watre, petrol, oil etc. Depending on what you use and how much you thinned it, would determine the shade you ended up with. And there was no set rule for a pattern. It was often upto local commanders. Somtimes they may even have just used one of the two colours. So the variety is endless.
You sure you still wnat to build Tigers.
I am a Norfolk man and i glory in being so
On the bench: Airfix 1/72nd Harrier GR.3/Fujimi 1/72nd Ju 87D-3