i also wanted to do my first piece with paint until i saw the prices and im not the type of guy who racks paint even if you call me a toy for not racking my paint
try sketching the same letter font that is on ur keyboard which are pretty much considered simples. practice simples forever. make bars consistent in width which means no lopsided letters make them even, practice spacing out ur letters like someone said make them same size and no overlap. all the fancy shit comes after this learning curve so don't rush, you must perfect simples first.
Doesnt really matter which brand tbh. As long as ur Using graff paint. Go to graffcity or bombing science online and u can get a can for less then a fiver. Bear in mind cans come in diffirent sizes. Most people get 400ml
Honestly any graff orientated spray can is decent enough for outlines and details. I'd personally buy cheap cans for fill (krylon/rusto or any cheap spray paint available in your country).
Lol yeah hes mad funny Artprimo is the company and utube chanle name. Grs name is green ranger . mofucking power rangerss!