Hi OP, if you have £1200 after rent, council tax and water, that's a great start. Do you have a pension? (Auto-enrolment at work?) Can you pay more in and will your employer match it? That's very tax-efficient (it gets taken off your gross pay before tax, so you are taxed on less) and if your employer matches any extra contribution, that's free money for you later.
There's loads of personal finance podcasters/bloggers/YouTubers around. I like Claer Barrett, Jason Butler, Damien and T, Ramit Sethi. Good old Martin Lewis and the BBC in general. Have a rummage around and find ones you like. I find them great for information and motivation. Also, for creating a 'crew' - if you don't have family/friends who like talking about money, an online equivalent can really help.
Advice you will often see says split your budget around 50% for essentials, 30% for wants, 20% for savings/investings. If you were to split your £1200 like that, it would be:
£600 essentials (utilities, debt repayment, dog care, insurances, food, fuel, transport for work, phone, essential tech, etc).
£360 wants/wishes (- hobbies, clothes, beauty/haircuts, holidays, days out, saving towards your car- I'd probably set up pots for each of these, because some have longer time horizons.
£240 savings and investments. First thing: build an emergency fund - aim for your first thousand, then work your way up to 3 months essential expenses, then 6. Somewhere along the way, you should start investing into a stocks and shares ISA.
Have a good look at your expenses and lifestyle, have a think about what you like doing, what you could happily live without if it meant more of something else.