Be prepared for the long-haul and be focused on long-term goals. I would advise that you focus on hitting that 4k goal first and foremost. 4,000 hours of watch time is very, VERY likely to get you 1,000 subscribers. However 1,000 subscribers is not a guarantee for 4,000 hours.
Getting that 4,000 is the more difficult of the two goals, but it is also no harder than one good video. I got my 4k after a couple months thanks to a single video. Focus on making your videos as entertaining/educational as possible, keep your viewers interest throughout and optimize well for search (SEO). Doing that will get your watch time, and that will get your subs.