Looking for some assistance! Will pay if absolutely necessary!

I am currently looking to build an Online Game that uses an external database to write and rewrite information (Players account information, characters levels and experience and inventory items and so on) I want all that stored in an external database that can be accessed through UE4. I have the VaRest plugin, I just dont know anything about creating API’s and creating security protocols to protect account data. Could really use some guidance or if you have any tutorials you know about please help me out thanks!

in youtiube search with " Unreal Engine 4 - Tutorial - Login System "

you wipl get lenty of tutorial