Hi M3KVU and welcome.
It's never too late to get started in this hillwalking malarky, enjoy your adventures.
Regarding your question re: finding the parking areas for the Munro's. Walkhighlands has made the task easy for you.
If you open the page of your munro, i.e. Ben Lomond by: (there are a number of ways)
Click the Bagging drop-down from the Main menu and select Munro's from the list
Click A-Z (near the bottom of the page)
Click on Ben Lomond (Under Loch Lomond Region)
Click the link under "Detailed route description and map", labelled "Ben Lomond from Rowardennan"
Click the link under "START" labelled "Open start point in Google Maps for directions"
This will open the start (parking) location in Google maps
You can then take a wee 'virtual drive' to your parking area before you even leave the house