I think that's rather too generic a question, to be honest!
You can own property personally or via a company but the tax considerations for each will be different. If you are needing to borrow funds to purchase property, you may find it easier to borrow as an individual but others will know more about that than me.
The easiest way of acquiring a portfolio might be to acquire from a landlord exiting the market like this chap: https://www.bbc.co.uk/news/uk-england-kent-47612106.
I suspect that they would be selling through agents so you could contact them and let them know what you are after.