Don't worry about it! The tracker is a tool - and the first thing it's going to show you is where you are TODAY. A year from now you'll be able to look back at all this info and realize how far you've come.
A small, inexpensive food scale can be a big help in accuracy, so is probably worthwhile. Keep using the tracker along with it and you'll soon have a much better sense of what you're consuming, what kind of nutrients you need more or less of, and how to achieve those goals.
Good luck with it. You'll get there!