Welcome to the forum.
3D modeling is a lot of fun.
Try this first CTRL+0 . It sounds like your screen may be CLEANED, which hides everything but the actual drawing from sight.
I am guessing that you used the APPLICATION button up in the left hand corner to open a template.
To the right of that you should see 2 or 3 icons and an arrow pointing down.
The arrow will open a dropdown menu.
Choose SHOW MENU BAR.
If you succeed in getting the MENU BAR to display then click on TOOLS, and there you can access the RIBBON, TOOLBARS, PALETTES and lots of other things.
ALSO choose WORKSPACE to show your workspace dialog box.
Open your WORKSPACE dialog and select a likely candidate.
You can also click on the OPTIONS button which displays from the APPLICATION button at the bottom right.
Go to the PROFILES tab and check and or choose one that sounds promising, then SET CURRENT.