Kevin the "BEST" way to paint a Tank is usually thought to be by using an Airbrush, of course you could use "Rattle Cans" but they do work out as very expensive and then there is the "Hairy Stick",
I generally do a bit of research on a particular Tank then find out what if any markings it wore.
I make my own decals where possible using an Inkjet printer and Decal paper from----
www.craftycomputerpaper.co.uk
Camo schemes work best for me if I have a coloured illustration of the Tank in front of me to copy.
If you have fitted metal upgrades you will need to apply a metal primer first and then comes the actual primer,
German Armour of WW2 was painted in Red Primer.
Before you apply any paint you ought to wipe over the whole Tank with ACRYLIC Thinners to get rid of grease and finger prints.
The cheapest way is to go to a car accessory store and buy a 500 ml Aerosol can of "Simoniz Red Oxide Acrylic Primer" for about £5, compare that with the Standard TAMIYA or HUMBROL Aerosol cans of 150 mls for about £8

No contest,
I always change the nozzle on the Simoniz can for one from the Tamiya or Humbrol cans for a finer spray.
Most of us use ACRYLICS as a base and topcoat simply because of the ease with which it can be used and its availability. and of course you only need water to clean your Airbrush,
If you are after an affordable Airbrush I recommend ----
www.bartsharp.co.uk
Peddinhaus / Archers and Elite all offer a comprehensive range of decals and can be found with the help of "GOOGLE" or "BING"
I perhaps should add that your HENG LONG/TAIGEN/TORRO Tiger 1 will come with built in faults that can be easily fixed by going to the "TIPS & TRICKS site on the Forum but you might want to do that before painting.
I hope that helps.
Shaun.