What do i need to paint my Xmod

[ron6]

i painted my skyline black with an airbrush and used Testors Gloss cote on it it did not come out good at all and the tape i used to tape stuff like lights the paint went inside of it i used clear tape. When i used my airbrush i mixed the paint with thiner but it made the paint water like and the paint started driping off the car and the gloss i used was not that shiny. Can someone please tell me what stuff i should use and where i can get it i got all my supplies from Michals what store can i get tamiya paint from i Liked how it woked on Bad companys car also can someone post pics so i can see how every thing is taped and so i can see the materials used please someone help me
Also what can i use to get paint off is there any thing else besides airbrus that i can use

Thanks