I want to be financially smart

Hey everyone! I’m soon to be 23 and started my first big time job a week ago. I get paid biweekly on a $75,000 salary. My mom used to pay off my credit card when I was in school but now she won’t obviously cause I have a job. I’m getting nervous now with all I’ll have to pay on my own while having to save. Here is some background:

• $75,000 salary
• Own a big dog that eats a lot (trying to cook for him to see if it’s cheaper but in the past it wasn’t)
• My credit card limit is around $1500 (I used to max it out practically every month)
• I have 0 savings
• I have a 401k benefit through Fidelity but I’ve never been taught how to deal with that
• I used to eat out a lot but know I should be buying groceries now
• Have a car that takes around $50 for a full tank (usually need to fill it up once a week since I drive a lot)
• I do not have to pay for rent as I live with my mom