Lots of hotels do airport shuttles, so if you’re staying in a hotel, check if they will pick you up. Otherwise you can get a metred taxi from outside the terminal. It will take about 20 minutes and cost around £20-£25.
You can take the train from the airport to central Tel Aviv. The station is outside the international terminal to the left.
For taxis when you’re in Tel Aviv, download the APP; ‘Get Taxi’ and you can order one to pick you from wherever you are
If you’re planning to explore outside of Tel Aviv, you should definitely rent a car. You can pick them up from the airport or downtown Tel Aviv from the Hilton hotel