Minecraft Forge installing problem?

My computer has been broken for about half a year. I recently just acquired a new one, so with all the updates, Minecraft has been pretty confusing for me to jump right back into and start modding.

That being said, I've recently attempted to install a mod. When I went to go install Minecraft Forge (1.7.2 Version, because the 1.7.4 Version isn't released yet.) It said I had to manually run 1.7.2 first. I jumped in at 1.7.4 so I can't go back to 1.7.2 myself using the Minecaft Launcher.

Please help i've been trying for almost a month to install mods, and personally Minecraft is pretty boring without them.

Added (1). I can't switch using the Launcher if I never had 1.7.2, also Forge will not install itself if I haven't played 1.7.2, becaue that is the version of Forge I'm trying to install.

Ok firstly there isn't a lot of mods for 1.7.4 but now you have to download a exe from forge which will install a profile for the new version then you install forge mods like you did before

I don't really understand the whole thing you're trying to say. But you can switch to 1.7.2 version easily with the minecraft launcher, if that's what you're asking.

Also, you can download the forge installer I believe, and it should just install and create a profile called Forge. Then you put the mod in the mods folder that is located in the.minecraft folder.