It is a good condition to have enough information on your Swedes before you contact us.
Looking in archives take time.
Following articles will give you interesting informations about Swedish source and possibility
So, you have Swedish roots
There are three major things you need to know
Swedish Legal Records
Tax records
Swedish  history
 About importent years in Swedish hitory, In short
Swedish language
Swedish alphabet and the another letters.
Emigrant Traffic
Swedish name