
James,
Al Hamdulilah, Allah has blessed us a new brother in Islaam! May Allah make all of us meet in Paradise so we can compare the size of our mansions and the number of trees we will have in our gardens of delight, insha'allah
You already have a head start

as Muhammad (peace and blessings of Allah be upon him) has said that whoever comes to Islam, will get all the reward that the good things they have done before they came to Islam, and all their bad things done before Islam gets forgiven automatically (Allah is just so kind to us) and you get more rewards for all the good you will do for the sake of Allah after embracing Islam (I am not too sure on the exact words).
The fact that you feel that Allah led you to Islam is true. He is the one who guides whom He wants and He knows who is best guided. He loves those who are humble in seeking the truth and loves those who make the first move. I guess He appreciated that you made the time to go to the mosque, and then read the Qur'an and as we muslims say, the mosques' are the houses of Allah, and He certainly made His guest feel welcome by bestowing these feelings of peace, tranqulity, contentment, happiness (I think the arabic term for all these english words is "sakinah") in your heart.
Since you made that one step towards Him, Allah took those many steps towards you James, to bring you closer to Him by guiding you to the truth. Al-Hamdulilah!
But as IsaAbdullah and *LJ* respectively said, to study and make dua to Allah, as Allah loves these things and will bring you even more closer to Him because of it.
Regarding your discussion with people who doubt that the Qur'an is the Word of God, just tell them to write a book of guidence better than it if they are telling the truth.
Regarding your point about people who say that Holy Books are only meant to control people. Say that they are right. Allah has indeed sent the Qur'an to control people, but they have the freedom of choice to follow or obey the guidence contained within it (with descriptions of what is at stake...).
And then add, this is unlike the man-made books (sometimes known as "constitutions") that you have no choice in following. For example, I cannot say, "oh I don't believe in Tony Blair (prime minister of UK) and so I won't pay my taxes". I will be thrown in jail faster than you can say "Freedom and Democracy"
Anyway, take care and may Allah increase us all in emaan (faith).
