I’m a first time buyer too, I haven’t even bought a house yet but have been looking for ages!
It took me about 3 months to feel as though I knew what I was doing.
First thing- google ‘how much can I borrow mortgage calculator’. It will ask you about your income and spending and will tell you roughly what you can borrow.
Add on to that the amount you have for a deposit and that’s the ballpark price of house you can buy.
Next look to see how much it will cost you to borrow that much. Google ‘compare mortgages’ and enter some hypothetical figures. Experiment with different house values, deposits and the term of the mortgage (usually can be up to your DP retires), and whether you fix it for 2 or 5 years. See what the monthly payments are and compare it to what you pay now in rent. This will help you get a more realistic idea of what sort of price you can afford and what sort of mortgage you might want.
Then start looking at rightmove/on the market / zoopla to see what is on sale in different areas for the amount you can afford. Under filters tick the box ‘include sstc/ sold subject to contract’ so you get a bugger selection of properties and what the asking price was.
So then you will have a rough idea of what you can borrow, what you can afford, and what you could get for your money.
Then it’s time to talk to a mortgage broker who will go through the numbers with you properly, and because you’ve done a bit of research first you will have a good chance of understanding what they’re explaining to you. Good luck 