Hiya! It's very difficult to advise somebody when we're all so different and there are soooo many different ways to maintain. My best suggestion would be for you to read around all the maintenance forums and try whatever takes your fancy. Some people maintain successfully & happily on a low GI/GL regime, others count calories or follow a weightwatchers or slimming world based plan.
We all have to find our own way, it's a matter of trial and error, there's no 'one size fits all' unfortunately.
I have to say though, you say you haven't introduced carbs yet ...? In that case it sounds like you haven't followed the refeeding plan ... you really must do this and do it to the letter as it's scientifically formulated to ensure you don't pile on weight. It introduces you to carbs in the right forms and amounts in the right order. This plan also gives you a good basis to build on for maintaining your weight.
Well done on losing all the weight, don't spoil it now by not refeeding properly.
Best of luck!