How do I inject a dll and run a thread safely not from dllmain?

[PsychicSounds]

I am just wondering how do I inject a dll and then run a thread safely not from dll main?
Because I have a dll and I want to inject to a process but I want to inject it safely not from DllMain how do I do so?
Please explain injector code and dll code

[Fovea]

Inject the DLL. DLLMain should contain minimal code. Call CreateRemoteThread on an export.

[Hell_Demon]

you could attempt manual mapping, however that is an advanced concept and should be properly learned instead of copy&pasting