which characters of alphabet means zero according to gematric rules?

As pointed out in the comments, each letter matches a number. No letter has a zero value.

since which time did Jews consider zero as a character equivalent to other alphabet characters=numbers?

I don't know.

if zero appears in gematria now, but didn't at gematria's beginning, how were adapted gematria perceptions?

Irrelevant, as per above.

Could somebody point me to further reading -

A good source would be Gematria on Wikipedia.

which characters of alphabet means zero according to gematric rules?

As pointed out in the comments, each letter matches a number. No letter has a zero value.

since which time did Jews consider zero as a character equivalent to other alphabet characters=numbers?

I don't know.

if zero appears in gematria now, but didn't at gematria's beginning, how were adapted gematria perceptions?

Irrelevant, as per above.

Could somebody point me to further reading -

A good source would be Gematria on Wikipedia.

which characters of alphabet means zero according to gematric rules?

As pointed out in the comments, each letter matches a number. No letter has a zero value.

since which time did Jews consider zero as a character equivalent to other alphabet characters=numbers?

The Torah already talks about Efes - Zero - for example when enumerating equivalents to Gcd's power.

if zero appears in gematria now, but didn't at gematria's beginning, how were adapted gematria perceptions?

Irrelevant, as per above.

Could somebody point me to further reading -

A good source would be Gematria on Wikipedia.

which characters of alphabet means zero according to gematric rules?

As pointed out in the comments, each letter matches a number. No letter has a zero value.

since which time did Jews consider zero as a character equivalent to other alphabet characters=numbers?

I don't know.

if zero appears in gematria now, but didn't at gematria's beginning, how were adapted gematria perceptions?

Irrelevant, as per above.

Could somebody point me to further reading -

A good source would be Gematria on Wikipedia.