If your goal is to race on the track competitively you will either:
- Buy only a track bike and ride on the track several times a week and maybe on the rollers at home.
- Buy a road bike and train on the road then rent/borrow a track bike for race days.
- Have both road and track bikes and train where it's most effective and/or convenient. This is the most popular option for several reasons.

If you live near the track and it's not a problem to go 3-5 days/nights a week, then the first option might be best right now. I know people who have done that with great success. If you live far away and will see the track only a few days a month, then a road bike will be more useful. There are lots of people that also do that with great success. I live 3.5 hours from the nearest velodrome. But, most serious racers have both and use the most appropriate bike for the job at hand.