[Pineapple]

You're not going to make any progress doing 100 reps.

www.startingstrength.wikia.com
Go to a gym and do it properly.

[Pineapple]

You can buy the book if you like, but if you read through the website you'll find everything.

"Putting the bar on your back and lifting it" is probably referring to the squat. The "ya know your on the ground on a bench and you push the bar up that has wieghts on it" is probably the bench press. The "your standing up straight and lifting the bar up to your chest and down." is probably the overhead press (OHP for short).

Starting Strength is a routine to follow & it has all of those lifts. Watch the video section on form/etc.

OR you could not actually care enough and be expecting super quick results and never make any progress like 99.99% of the population who consider lifting for some useless excuse.

[Pineapple]

Do you have a gym near you? Find a gym that has a squat rack & read Starting Strength; then eat your heart out & lift some heavy-ass weights. 😁

[Peso]

I'm not a gym expert, but I'm pretty sure doing a 100 reps of 7.5kg isn't going to make progress at all.