25 X 10 is a great size for a starter garden. If it were me, I would go with 4' X 10' raised beds especially if you can run the long side oriented north/south.
Depending on what you want to plant, you could put perennials like raspberries/asparagus/rhubarb on the far end/back of the garden with beds for the stuff that needs more tending/picking in the front.
Advantage of beds is that the soil stays really loose (never gets walked on), are really productive, and weeding is very easy.
All kinds of things you can use to make the beds. Can get by with only 5" sides but taller is better. I'd start looking now for low cost materials. Folks use all kinds of things including galvanized steel panels, mill ends from lumber yards, and silo staves.
If you want strawberries I would order the plants now as many varieties sold out very early last year.