Glad to hear this and welcome to the dark side. As others have said, your number one job right now is hydration and rest. I know you will feel like you aren't getting enough nutrients to survive, but trust me, food is secondary now. Hydration is not optional so find whatever works for you to drink (this was extremely tough for me as I just wasn't thirsty and everything I tried to drink tasted like garbage).
As far as protein and eating please keep this GOAL in mind as it really helped me.
At 30 days the goal is 30 grams of protein daily
At 60 days the goal is 60 grams of protein daily
At 90 days the goal is 90 grams of protein daily
Please remember that is only a goal and if you aren't quite there you will not starve or have a serious health issue.
BTW, if you can stomach the protein drinks (I could not), you kill two birds with one stone as it is getting you hydration and counts towards your minimum of 64 oz of fluids daily (not optional) and it gets you some protein without having to eat anything. As you know, eating right now after surgery is very difficult.
Good luck with your journey. I am sure you will do fine.