1 gram to yourself for a first time is wayyyyyy too much imo. Maximum I'd do in a night for your first time would be half a gram and even then make sure to space out bumps about 5-15 minutes. You gotta remember, cocaine is a very powerful stimulant. It isn't super easy to overdose on, but it is still not hard. For a first time user it can be easy to get carried away and go to far. Take it slow

There also isn't that much of a comedown. Most you'll probably feel as long as you don't do it for 24 hours is sleepiness, elevated heart rate, insomnia and possibly sinus pressure. I don't really ever have even those symptoms unless I wayyy overdo it.