Hi, and welcome to the hobby!
So to answer your questions :
1. The set is a good introduction, and if you look at the box in the lower corner it has a green square with a white cog/hand/wrench symbol, which makes it an easy to build kit - just slot them together and you are ready to go. You can a small amount if glue if you want, but they are surprisingly sturdy without!
2. The paints you get in the box are called base paints, and can be used to undercoat your model without a primer. However, if you want, you can buy either white/black primer which is an extra cost, but it will make painting the models easier. Imperial primer has been discontinued for a while, so either coral white or chaos black spray is the ones to use.
3. The sprays are both a colour and primer in one on the GW site, so if you know what the main colour of your army will be, using a spray will save a lot of time! Not all colours have a spray, as it's usually the more popular colours too.
4. Unfortunately, Necrons don't have an easy build kit, or a paint set unfortunately. However, Necrons are quite easy to build however, so just take your time, and it will get quicker and less effort the more experience you get! Also, they are probably the easiest army to paint - Duncan's tutorial on Warhammer TV will show you just how easy they are!
Hope the info helps!
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