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In counting you can replace один by раз. So instead of "один два три..." you can have "раз два три...".
I think ъ has something to do with some kind of pause when pronouncing the word or to seperate...

After reading your list I will say that you've mixed up ы with ь. It would be 700 syemsot and not syemicot.
Why don't you use the link below, it may be very useful for you. ...

The number 9, дЕвять, is pronounced (dyeveet'). Same for number 10, дЕсять, which is pronounced (dyeseet').
Do you know where the tonic is in all these numbers?