Import - Match data fields from old forum

Am attempting to manually import in mySQL from an old forum script.

Not sure how to handle a few fields:

Table: xf_user_authenticate
Field : data

Is there a simple helper function somehere to help convert from unencoded text password to data format that is compatible with login authentication?
Read somewhere here that can use an md5 + salt but not sure how to enable in any config so login will work. Also how to generate remember field?

Table: xf_node
How to assign 'lft" and "rgt" values ?
Thanks Jake,

Although I don't understand the "lft" and "rft" fields for nodes in xf_node table, I managed to get my full import up and running from an ancient coldfusion script in MSQL