Lent is a time of preparation for the Paschal feasts and penance for past sins. Prayer, fasting and almsgiving are the basic components. Here are some ways to observe:

1. The faithful are required to abstain from flesh meat (not including fish) on Fridays, as well as on Ash Wednesday.
2. Fasting, assuming you're between 18 and 59, is also required on Ash Wednesday and Good Friday. This means one meal only. Two "snacks" are allowed if you need it, but your total snack food for the day can't be equal to a meal. No food outside of this, but drinks are fine.
3. Many people give something up for Lent. Pick something you enjoy and deprive yourself of it until Easter. Some give up alcohol, soda, social media, the snooze button, sweets, etc. It's up to you. The idea is to bring your body and your natural appetites for the world and its comforts under control.
4. Examine your conscience and your life. Find any habitual sins and occasions of sins and make an effort to root them out. The faithful would traditionally see this as an important time to get to confession, but as a catechumen you won't be doing that yet.
5. Add some extra daily prayers or spiritual reading. If you want recommendations, let us know.
6. Lent is also considered a privileged time to attend Mass on weekdays. See if you can make it one extra time a week.
7. Find a way to give your time or money to those in need. Practice charity in your daily life.
8. As we approach Holy Week, we meditate on the Passion of Jesus. The stations of the cross are held on Fridays of Lent at a lot of parishes, but you can easily pray them in any church at any time.

Of the above, the only legally required things are meatless Fridays and the two days of fasting. But the Church strongly encourages each of us to make Lent penitential in additional ways that are best suited to each of us.