So I am needing some tips and advice for food and protein shakes for when I start and exercising tips I have already started walking a mile everyday except yesterday and doing 20-25 squats everytime I take a little break.

There are lots of diet plans, both pre and post WLS so it's hard to say exactly what you should do. Personal preferences also play into this a lot.

I'd recommend talking to your team as they will have the best info regarding their plan and what they want you to do. As far as protein drink recommendations, I prefer the Fairlife Nutrition Plan pre-made shakes to most others. On the exercise front, sounds like you have a decent plan already, but I'd add a couple of things:

1. Squats are great, but don't neglect your upper body or core. If you can, add in some planks, side planks, pushups and pullups. All of these can be modified to where you're at physically. For example, if you can't do a regular pushup, start with wall pushups. Progress to an elevated surface such as a bench, then move on to a pushup on your knees, etc.
2. Make sure you keep in mind that you want to keep progressing in both the strength and cardio work. So maybe instead of walking just a mile and quitting, try to extend that a few minutes this week, then do a few more minutes next week, etc. Work up to 45 minutes to an hour a day. Instead of just increasing time, you can also vary your pace with walking "intervals". This would be maybe 30 seconds of all-out walking as fast as you can, followed by 2-3 minutes of a more normal pace to recover. Over time, make the all-out push last longer and/or shorten the recovery period.

In terms of protein shakes, I don't recommend getting a giant bag/tub of protein as your tastebuds might change after your surgery. Get pre-made ones & I cannot recommend Fairlife protein shakes enough! They cost a bit more per serving vs powder protein but in terms of taste they're A+

I've tried both their 26g protein & their 30g protein versions & they're both delicious.

I recommend Premier Protein shakes only because they taste great and they give 30g of protein per serving. I get mine at Sam’s Club here in the US as they sell them in bulk and they have the chocolate peanut butter ones, which I love. After surgery you won’t be able to chug your protein drinks or really any drink so it will be a bit more of a chore to drink them with small sips.