So, I tried to run Minecraft right after installing forge in Eclipse, using the main net.minecraft.launchwrapper.Launch, and program arguments --version 1.7 --tweakClass cpw.mods.fml.common.launcher.FMLTweaker --accessToken modstest, and VM arguments -Dfml.ignoreInvalidMinecraftCertificates=true. The result was these errors:

Unable to launch

java.lang.reflect.InvocationTargetException

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_05]

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_05]

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_05]

at java.lang.reflect.Method.invoke(Method.java:483) ~[?:1.8.0_05]

at net.minecraft.launchwrapper.Launch.launch(Launch.java:134) [launchwrapper-1.9.jar:?]

at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.9.jar:?]

Caused by: java.lang.UnsatisfiedLinkError: no lwjgl in java.library.path

at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1857) ~[?:1.8.0_05]

at java.lang.Runtime.loadLibrary0(Runtime.java:870) ~[?:1.8.0_05]

at java.lang.System.loadLibrary(System.java:1119) ~[?:1.8.0_05]

at org.lwjgl.Sys$1.run(Sys.java:73) ~[lwjgl-2.9.1-nightly-20131017.jar:?]

at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_05]

at org.lwjgl.Sys.doLoadLibrary(Sys.java:66) ~[lwjgl-2.9.1-nightly-20131017.jar:?]

at org.lwjgl.Sys.loadLibrary(Sys.java:95) ~[lwjgl-2.9.1-nightly-20131017.jar:?]

at org.lwjgl.Sys.(Sys.java:112) ~[lwjgl-2.9.1-nightly-20131017.jar:?]

at net.minecraft.client.Minecraft.getSystemTime(Minecraft.java:2690) ~[Minecraft.class:?]

at net.minecraft.client.main.Main.main(Main.java:40) ~[Main.class:?]

… 6 more

How would I go about resolving these/what is causing these? Thanks in advance

It looks like your error is coming from line 40 from your main class. I may be wrong but check there.