I have used champagne or crown corked bottles before.
I use a regular #8 or 9 cork with a wire.
I just put a standard crown cap in between the wire loop and the cork. It' works for me.
If you have a champagne corker, all the better.
If you can't use the hops fresh then there is nothing to stop you from
drying and freezing them.
I did that last year with my very meager harvest and I used them recently as a dry hop on a summer wheat all grain. The beer was delicious.
I used maybe 1/2 oz. full leaf for a five gallon...
It may have been a fast ferment and could be ready to move to secondary.
You should get a hydrometer to be sure. That's the very best first upgrade
you should do right away.
In any case, opening the fermenter is ok just not too often and keep it as
clean as possible.
As far...