Never played multiplayer or online co-op.

I was wondering how to play co-op on Halo 5. I got an Xbox Live membership recently and I could use some help on a couple of achievements and a couple of campaigns on legendary playthrough. I've added friends (no one I know) but nobody is ever playing halo
5. How is it done or is it possible to get someone to play for just certain levels of the game? I never really liked split screen but at least I could weasel a buddy of mine to play just to get an achievement. Unlike all the past Halo games where you could
pIay split screen they obviously did plan on this for halo 5. You probably know how it is. Why let anyone play at home with a buddy for free when you can force them to pay for a live membership.... like usual good ole greed at play. I fall into the seniors
category age wise so my friends think I have some kind of disorder for playing video games. Can anyone help with these questions.

:)

 

MGS PW co-op and multiplayer

How do you jump into a multiplayer or co-op game? I've only played twin snakes and sons of liberty and I've never gotten to experience MGS multiplayer. Can anyone help me out? Also, if anyone is looking for a friend to play some co-op mission I would appreciate
a message or FR.

 

What are some good online co-op games?

- My Greatest Co-op Game List:-

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Red Dead Redemption (Multiplayer Online)

Left 4 Dead 2 (Campaign Co-op, Survival Co-op with Multiplayer Versus and other modes)

Left 4 Dead (Campaign Co-op, Survival Co-op with Multiplayer Versus)

Dead Rising 2 (Campaign Co-op modes, alongside with Multiplayer Competitive)

Halo Wars (Campaign Co-op and Multiplayer Competitive)

Gears of War 3 (Campaign Co-op, Horde co-op and Multiplayer Competitive)

Gerars of War 2 (Campaign co-op, Horde co-op and Multiplayer Competitive)

Gears of War 1 (Campaign Co-op and Multiplayer Competitive)

Dead Island (Campaign Co-op and Survival Co-op)