South Oxfordshire — and Wantage in particular — is an excellent area for first-time buyers. Prices, while not cheap, are considerably more accessible than Oxford or London, and the OX12 postcode offers excellent schools, amenities and long-term value growth.
The key first step is knowing your budget. Speak to a mortgage advisor to get an Agreement in Principle before you start viewing — it will focus your search and show sellers you are a serious buyer. Flats and smaller terraced homes are often the best starting point in Wantage for first-time buyers.
Consider a Lifetime ISA (up to £4,000/year with 25% government bonus) if you haven't already opened one.