Well, just don't make any assumptions, don't go too fast, do some research into cult mind control, do some research into critical thinking, and don't trust anyone.
Other than that it's really easy...
By assumptions, I mean that I walked away as I couldn't live my life that way. I went to University. I came to some conclusions in that process that were rather different to the ones I'd grown up with. I may not of had those assumptions challanged if I hadn't been to Uni'. You don't have to go to Uni', but you shouldn't assume (for example) that there is no such thing as the soul, or that there is a god, unless you have examined that assumption from the ground up. To do that succesfully, i.e. to avoid just reconfirming exisiting beliefs, you have to do other things too, but I'll mention those in a minute.
Don't go to fast. You've had a big shock. Any god worth bothering about is going to know what is in your heart and give you time to sort your head out. You might need to re-build your social circle for example, otherwise solitude could make decisons for you.
You need to understand how the JW's get you to believe what they get you to believe so well. I recommend 'Combatting Cult MInd Control' by Steve Hassain as a starter.
Part of the control that cults exert is starving followers of real knowledge. Sometimes this is so profound that people cannot analyse a problem to anything other than the most superficial extent - not a matter of brains, a matter of knowing how. Here's a random link on Critical Thinking to get you started; http://www.sjsu.edu/depts/itl/.
Lastly, don't trust anyone; loads of Christians will turn into really good salespeople when they find out you have suffered a crisis of faith recently, as they are well intentioned for the greatest part and think they are righter than others for the greatest point. You need to figure things out for ourself, not let someone sell you thier beliefs. Thus this advice applies to cocky scientific so-and-so's too, as they also are well intentioned for the most part and think they are righter than others for the most part.
I know my mind, as my posts show, but I don't want to tell you what yours is...
All the best, don't worry, life will be better than you ever thought it could be, even if that seems unlikely now.