You are 16, have had some practice. For the details, you sound like you have the potential to be an all-rounder.
1.First focus on improving and maintaining your fitness and agility. This is very important for present-day crickters, to have an edge over others.
2.Have good professional advise on your nutrition that will give you proteins and good supplements.
3.The two things are the basics if you intend on a career.While you start this, approach your last cricket club, college team or the coaching centre and start playing matches in the neighbourhood.
4.With summer approaching many summer camps and training centres offering good focussed training. These may be a little expensive but for you at 16 with an eye on a cricketing career, this would be a good investment.
5.After a short intense training, you would have improved your skills to make people notice you. Make videos of you best spin bowling that shows that you are a good turner of the ball, try to include variations, stumping deliveries etc. Also make videos of your agility in the field, chasing the ball, stopping a four etc. The same goes for your batting skills. Then you upload the video on youtube and share it in what's app groups.
6.Then contact to the local coaches, additional coach or state cricket players etc. Keep trying and playing regularly and once you find the right person who recognises your potential, they would be able to help you get to the level of under-19. If you are talented and skilled you can even have a shot at the IPL in a few years.
7.Be on the lookout for cricket talent hunt competitions, try and meet up with the local IPL teams. The season is just starting, try to get into any of your state IPL teams as a volunteer that would get you to rub shoulder with the right people in the game.
8.Some examples for talent hunt
https://www.goeventz.com/event/register-for-navi-mumbai-cricket-talent-hunt-2018/55932 (just got over)
9.Some examples of training academies
Please be careful with money and payments for these events
10. Discuss with your parents and also don't forget your education. It is important to have at least a basic degree, to have a back-up plan.