Hi, I'm not a former witness but I believe I can speak to your question. First of all, if you repent of your sins and ask Christ to take control of your life, you are filled with the Spirit. Although some people will tell you that you have to experience something like speaking in tongues, the letters of Paul in the Bible clearly state that not all have tongues...even back then! I suggest you read Paul's letters in the N.T., especially the parts on spiritual gifts. Of course don't read them i n the NWT. You'll find it interesting.
You may also find it interesting to know that among Bible-teaching Christian churches, there is quite a disparity of belief on whether or not the gifts continue to this day. I know people who sincerely love God and are saved who go both ways. Let me caution you (and I know that this may be a problem having come out of WTS) that this, in my opinion, is an area in which Christians can have differences of opinion and still both be saved. The important thing is that we know that we are saved by grace!! I have known of people in churches where not only do they believe in the perpetuity of spiritual gifts but people become depressed or feel like they are missing out, less spiritual or perhaps even unsaved if they lack tongues or some other "showy" gift. Paul clearly lets us know that this is not true--read I Corinthians 12 (the whole chapter), and also I Cor. 14. By the way, where chapter 14 talks about prophesying, I suggest you think twice about what it really means to prophesy. There's more to prophecy than the traditional Watchtower business of making predictions. There is more than one meaning; if you'd like to learn more I'd suggest you read Grudem's Systematic Theology's section on spiritual gifts. It talks about prophecy as wisdom given one from God. You can get Grudem's Systematic Theology in any good Christian bookstore, or you could get it online from Christian Book Distributors. It's very readable even for non-theologians! We use ours all the time.
In closing, I don't want this issue to discourage you. Find out the truth from the Bible, not just from what others have told you (that's what gets people into trouble, as I'm sure you well know). As for me, I'm still deciding what I think on the whole issue. I think some of the gifts continue, but I'm not sure about others.