That's good advice from Batty. I started using Access about two years ago, and it took me over a year to realize how important the planning is. Now I start with pen and paper.
A bit of advice...
1. Forget about Excel...for a while, at least. Try to resist the urge to make one big flat table in your database.
2. Read this forum. Search it when you have questions. If you don't find your answer, post your question. I refer to the forum more than my books.
3. For your primary table, try to boil your vehicle info down to what is absolutely necessary to identify a vehicle, including any data that will NEVER change (like VIN, date of manufacture, etc...). Anything else goes in another table. (more or less)
Good Luck,
Sarge.