firstly, google is your friend, googling tips and tricks can help you unerstand what you can do to your models, to make em better. As for whats a good starter, really anyting high grade is a good start, since they're arent a lot of parts( compared to the other grades) to them, my advice, start with a 1/100 scale, they're a middle road in terms of parts size and amount. as Moon said, the parts dont require painting, but, it can allow you to make your own " custom paint" unit. testors paints work quite well.
as for toolkit, for construction a sprue cutter is a definite requirement, for stickers you should use a tweezer, and a hoppy knife can be a nice addition to add details to some parts anyway) also, invest in a file set and sandpaper.
Edit: what shops sell them around your place? if anything take an inventory then decide.