I have started to buile Military models after 10 years. i have a limited budget, the baints i use are Testors and Model Masters ,Glue is Testors .my question is ,i want to build them to look life like and to put them on a diorama.any tips on if i should use better glue and paints or are there things i,m missing,that i should use as well.Also when i paint the pieces i use testors spray paind should i just paint one side to make the glue adhere better ? any help on this will be very helpful

Nothing wrong with your consumables, but assemble as much of the kit as possible before applying paint.

thanks for the help ,another thing how would i try and make the tanks look lifelike and weathered with my paints model masters and testors

Not an easy question to answer, the best I can do is to tell you to use the search ability at the top of the home page and search for threads on weathering, ageing AFV's, also you can learn a lot from the build articles on the site as a lot of what you want to do is covered, and allows you to see what sort of finish can be achieved.