Don’t bother with buying a vacuum sealer. I use ziplock bags and a straw to suck the air out. I used to use water submergence to displace the air, but now, don’t even do that.
If using ziplock bags, try to not submerge the zipped opening in the water.
Get a plastic container, and a metal rack. I used to clip to ziploc bags to the side of a stock pot, and hang the controller on the edge. Now, multiple steaks can stand in the racks, have good water flow around them, and remain submerged by being wedged into the rack, and the zippered opening can remain out of the water.
If using higher temperature and long cook time (eg. 160dF & 48 hours), double bag - standard freezer ziplocs will fail.
Try sous-vide confit - I did Thanksgiving turkey that way. Put turkey legs, breasts, and wings into ziplocs, fill with bacon grease, then sous vide. Finish in Hot (400dF) oven to brown the outside. I did 130 for 24 hours for breasts, and 150 for 24 hours for the dark meat. Best compliment - my son in response to “how’s the white meat?” - “Oh its great - like dark meat, except its white!” high praise!
I have a WiFi/bluetooth Anova, so I can monitor the sous vide settings from anywhere with my phone.