store seed at 40F for 12 weeks then do not "crack" seed just lightly cover soil temp 70F & may take up to 365 days to germinate.
the plant will NOT be like the parent & may take up to 10 years to flower & the fruit may be har & uneatable.... use seedling to graft a know variety .

Here is a detailed article on saving stone fruit seeds.

Here is a link that might be useful: Growing peaches, apricots and nectarines from seeds