If you are confident in your bank roll building skills, Id say to stay online till you have enough in your intertops
roll to withdrawal and still have money to keep online. In your case, realize that when you withdrawal your roll, your ability to make money will decrease substantially as live games are way higher buy in , effectively making your roll a micro live roll. This will put much strain on your roll and your mental state. Unless you are willing to go broke playing live, keep this in your online roll, till you have around 2k, then take out 1k and play live and keep 1k online.
Even still a 1k roll live is only 5 buy in at 1/2 cash and less than 20 buyins of 50 dollar liveaments. Remember the rake will be higher live, and other expenses assoiciated with grinding live ie gas, food, money traps (casino games). Usually factor all this, and playing low stakes live is not very profitable to the transitioning online player, ( unless your so good, but even then variance and swings will make you lose your short roll eventually).