WW1 era Russian banknotes - identification and value?

Hello all, this is my first actual post on the forum.

I recently bought these old Russian bills in a little shop in Bulgary for next to nothing, though there are a bit worn.
Now I was wondering if anyone could identify and value these?



Thank in advance guys!

-Jack

left picture:
ГОСУДАРСТВЕННЫЙ : STATE
КРЕДИТНЬЙ БИЛЕТ : CREDIT BILL
ПЯТЬ : FIVE
......
I have used google translate and copied the cyrillic....

The first one seems to be one of P-10a or P-10b but I can't find the right one (neither by s/n or sig).

The second one is 1,000 Rubles, P-S418b.

The third one is 500 Rubles, P-94a.11.

Cool, thanks for the info!

Can anyone guess for what they would sell nowadays?

cheers,