The format is .import CSVFILE TABLENAME [0]. If TABLENAME already exists, it would use that schema. Otherwise it will all be TEXT data using the first row as column names. However, SQLite uses dynamic typing (they call it "type affinity") so it kind of doesn't matter.
I like SQLite a lot, but one of the funniest things about it is how they try to sell you that type affinity is a great thing [1] when really it's not at all what you want in 99% of RDBMS situations. There's a reason that everybody from MySQL and PostgreSQL to MS SQL Server, Oracle, and DB2 use static typing.