You have not given much details, so it's not clear what type of data you are trying to get into SQL. Using SQL (which could be mySQl, SQL Server or other database using SQL) could be a good option depending on the type of data you are importing.
For example, is it the entire google doc you want to import? If you just need to manage documents, perhaps SQL is not the type of product you should be looking at. I'm assuming you may be interested in importing the actual data within the documents. In that case, using a SQL based product could be a good option and both SQL Server and mySQL have tools to assist with the data imports from the documents. However, you should proceed with caution when importing data, meaning you will need your data organized, cleansed and transformed before importing, and you will need to create the structure of tables to import the data into. Additionally, if you're not very tech savvy, simply having data in SQL may not be useful to you. You may require a better UI than the SQL tools to easily view and manipulate the data. You really should get someone with data experience to assist with deciphering your data.
There are also other products out there you can use which are more applicable to users who do not have a lot of technical experience, again depending on what you will like to store and how you want to access that data (egs. SharePoint, SalesForce, Dynamics, as well as multiple cloud base platforms that could satisfy your needs).
It all depends on your level of expertise, the type of data you need stored, and your plans for using that data. It's a lot to swallow and I agree with Igor you should collaborate with a techie or data person.
Also, I don't think the "warehouses" you refer to is an actual product. I'm assuming you are referring to data warehouses maybe, which is just another database structure in which your data can be stored. These structures can be built in SQL Server or through other platforms as well.