Keep a journal by your enlarger and write down your enlarger height, f stop and amount of time for your prints. It will be easy to reproduce what you did and what failed until you get the hang of it. Your notes are essential for going back to an old neg and printing it. Measure your chemicals carefully, don't eyeball. This can be a fatal mistake, I know. As far as dust, buy everything you can to clean and protect your negs, equipment etc. Vacumm your dry area don't use the air in the can. The darkroom is a magical place, hang in there.