You’ll need good quality independent mortgage advice but in the meantime look up all the pros and cons online you can find and try and research as much as possible.
I’ve been doing this for 25 years as a landlord and in the industry and whilst it’s good, it’s not as good as it was and there are far more pitfalls than previously. For example there’s extra stamp duty and if you’re a higher rate tax payer (or close) the level of tax relief on the interest is falling over a 4 year period which makes it a bit less viable. Regulations are stricter than ever before.
A quick summary - it used to be a get rich quick model for many investors, but that was mainly due to house prices rapidly increasing from the early 2000’s like no could foresee. If you owned a few you, your assets increased significantly. In the last 2 or 3 years more landlords have sold than ever before as it’s got much harder to make a profit. I’m not saying don’t do it, I’m saying really understand what you’re getting into.
Without trying to put you off, personally I’d be wanting to get more equity in your own home first and building up that before diversifying. You could find yourself spread too thin if there’s a drop in the housing market.