Any Help Is Appreciated!

How would I make something like this work?

CREATE TRIGGER [tr_update_doc_count] ON [Documents]
FOR INSERT
AS
[Declared variables]

[I want to get the tablereference from the inserted information]
SELECT @tableref = Table_id, @Account_id = Account_id from inserted

[Then I get the Actual Table Name from the UsercreatedTables Table where it is stored]
SELECT @tablename = TableName from UsercreatedTables WHERE Table_id = @tableref

[Now I want to use the @tablename I got from UsercreatedTables in the query]
SELECT @Current_Doc_Count = Account_Docs from @tablename WHERE Account_id = @Account_id

I am not sure how to get it to use the variable @tablename for the table name in the last query.
It gives me an error stating that @tablename is invalid syntax.

Any help is much appreciated!