Congratulations on your engagement!
One of the best pieces of advice I can give you is to head to your local library or bookstore and pick up a book on planning your wedding. You'll find a wide array of choices, including planners to help you keep organized, books on budget-friendly weddings, wedding crafts, etc. Pick the one(s) that seem to suit your own situation. Books like these can be an invaluable resource and will help you get a handle on the process.
Your wedding may be the biggest and most complex event you'll ever plan (until you plan your daughter's!), and having access to the kind of professional guidance available just for the price of a book is the best investment you can make if you don't choose to use the services of a wedding planner.
My second most important piece of advice is to enjoy the process, not stress over trying to make everything perfect. Perfection is impossible to achieve, and holding yourself and everybody else involved to that standard puts undue stress on everyone.
I tell my brides that if, at the end of the day, you're married, you've accomplished your goal. And when things go wrong (and they will), those are the things that make great stories to tell to your grandchildren!
Marti Barton, Officiant
Joyful Promises http://www.joyfulpromises.com