Confusing instructions (berries)

I saw this:
    Cold stratify for 60 days, this can be achieved by mixing seed with damp vermiculite in a bag and placing in refrigerator.

-Instructions for sowing blueberries and I don't understand 'stratify' and 'vermiculite'.
Is this important? Am I ok with just sticking them in the freezer for two weeks before sowing?

I saw similar instructions for sowing raspberries and I want to sow both now. Please explain the confusing words and tell me what to do. lol.

Do what it says!  Vermiculite can be bought at garden centres.  Stratifying is subjecting the seeds or berries to a false winter to break dormancy.  Then you can sow them but do not expect anything to germinate before the spring.

Putting them in the freezer (especially if they are dry seeds) is not the same at all.  There is no point in sowing now anyway as they will not germinate any quicker.  If nothing comes up in the first Spring it is probably worth keeping the pots until next year.

Of course growing from seed like this means you will probably get inferior plants to the ones that the seeds came from because they may have cross pollinated.  Raspberries send up shoots everywhere, so why bother?  I guess you have to take cuttings or layer blueberries to keep them true.

Gillie, are you suggesting I'd be better off buying a plant? - The thing that puts me off buying plants is wondering how they've been treated. I'm such a noob when it comes to berries.

Yes, much!  you will get a plant of known variety which will crop in a year or two.  Growing from seed will take much longer and there is no knowing whether it will ever bear a decent crop.

Buy from a reputable supplier or good strong looking plants from a garden centre.

our blueberries from Parkers were tiny 2 years ago but are now lovely healthy bushes...

oooo not sure, think in autumn?