international sales please help me :)

[slimgympt]

I have been slowly trying to build a business here 🙂

doing ok ...getting sales and people perusing my wares 🙂

due to our $ being low at the moment i am thinking maybe selling overseas may be a good thing ....thinking...maybe....

never posted sold goods overseas

i want to ... but.... 

i like posting my items with a set price (including postage or ''free postage'')

obviously i cannot send overseas for the same price

i also do not think i should have to work out all the different prices for different countries and commit them to memory for each different size item i sell 

(my items vary a lot in size and weight )

I am trying to work out the how to's of selling overseas by adding the postage price

i would like :

it to auto work out the postage for me 

the auto postage price to be correct (and not cost me extras)

to be able to use the same ebay postage label print option

so i guess my questions are (after this long winded intro)

HOW do i set up the international postage to be 'as per transaction'

like is it to canada or portugal or ...etc

do customers from these places see the auto postage price on the sale already from ebay?

if not ...HOW do i put a marker so overseas customers ask me the postage price (happy to evaluate each but prefer it to be auto )

im worried most that if i do it wrong someone from somewhere will buy something and i will send it to them but it will end up costing me more than my profit margin

thanks 🙂