Who can baptize and is getting baptized again ok?

My husband and I have been trying to find a church to go to for the last couple of months, and we have finally found one we are going to start attending this weekend. I was baptized as a teenager, and I knew what it meant, and I accepted Jesus as my Lord and Savior. However, after being baptized, I still went on to sin here and there, and I didn’t fully understand the entirety that came with being a Christian. I have always asked for forgiveness of sin, but now that I’m older and married I feel like I know more of the things that I should and should not be doing as a Christian. My husband has never been baptized and he is ready to be baptized now. I was curious if I should get rebaptized with him now that I have a deeper understanding of things, or is this unnecessary or wrong? I was baptized in the Catholic Church and the priest did it with sprinkling of water. Is there anything to being dunked completely under?

My other concern is, I know there is a lot of talk about the end of times being near. There’s also a lot of talk going on about the rapture being soon. I’m not sure where I stand on the rapture exactly. But I want myself and my husband to be ready if it happens soon. With that said, can any Christian baptize someone who’s accepted and believes in Jesus? With the church it’s going to take a bit before he can get baptized. I almost feel like why wait? Wouldn’t it be best to do it as soon as you accept Jesus so you are ready when the time comes…. Maybe I’m overthinking this. But I need some advice please and thank you!