College website have areas where you can register your interest. Basically have some bio information (like a CV) available and video footage. I would get on a tour that exposes you to scouts. Some tours, have this as a purpose, whereas some are about a "Basketball holiday". Find out before you go what you are getting.
Be careful of people that over promise and under deliver. I've heard of people setting clinics branded "college preparation" clinics only to raise the expectation that this is the pathway to college only when all it was, was designed to generate a market for their clinics.
Ultimately it comes down to you if you are good enough. If you are contact enough colleges and you will get offers. Also, be careful about colleges telling you they are interested. In my experience an Assistant Coach will get a lot of kids on their list, telling them what they want to hear only to pick the best ones and then changing their story to the ones that aren't good enough once this happens.
Make sure you are doing the right subjects and playing in the right competitions to ensure your eligibility for the level of school you want to get into. Talk to people that have contemporary exposure to these pathways and are reputable, as I've seen kids get poor advice from so called self branded "experts" only to be let down when they find they are ineligible. Often your NITP head coach, club president, coaching director or ABL coach will be a good starting point to locate who these people are.
Also, at U18 Nationals there are often a range of US college coaches there watching and this is a great place to get footage. People watching video scouts can see easily if you are dominating against crap opposition or at a high level (I've seen great footage of players dominating, but against 40 yr olds at social basketball).