Relatively new to tinting

Hey everyone, I'm relatively new to tinting, I tinted for about 6 months and gave it up because it's hard to make steady money in a small town. I recently started back tinting in my spare time after moving to a slightly larger town. I tint out of my dads car audio shop and I think my biggest problem is contamination and tucking the film on roll downs. I dont know if I'm using cheap film or what but it is very thin. I think my contamination is mainly from the bay of the shop not being very clean but I'm not completely sure. I also have a problem getting contamination when I peel the liner 3/4 of the way down and lay it on the inside I get a line of dust where I peeled the liner. Looks like its rolling down the tint and stopping where the liner hasn't been removed. Any tips on how to keep this little line of dirt out? Thanks guys I've been a forum browser for a few months before deciding to actually post because I really didn't want to get flamed for my lack of tinting knowledge but I guess everyone has to start somewhere. I'm only 22 so I figure I have awhile to learn some nice tricks from some experts! Any advice would be great

where you from? people around here like to know that info. what brand of film are you using? i had this problem to, then the light bulb came on, when you roll the window up any contamination from the felt strip is on the window. you need to use your sprayer and flush it all down to the bottom. i wasnt going high enough.
i work out of a car audio shop also and what i do is after i get there and before i pull in any cars i sweep the floor. i know im gonna get slammed for that comment but hey ya gotta do what ya gotta do. or if you know you have a car to do first thing in the morning sweep the night before. as far as tucking goes try not to over size your film to much.

I have some suntech film and I cant really think of the other brand of tint I just used for the first time yesterday. I will post the name when I figure it out.

where the heck did that come From. Insta Ban now active.