use weight and price on table rate

I am deperate. I have to ty and integrate this in the table rate plugin and I’ve tried everything.
Standard: – $20 if order under $99
$20 if one or more items are over 25kg
$10 if order over $99 and no item exceeds 25kg
$30 if order is over 100kg together

Express – $30 if order under $99
$30 if one or more items are over 25kg
$20 if order over $99 and no item exceeds 25kg
$40 if order is over 100kg together

I have two tables one standard and one express and had selected price where it says price and weight where it says weight but I have no idea on how to make it work. I find the woocommerce documentation really confusing. Any clues?
Thanks
Tanzi

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