I work with guys that do this for a living so I cannot share exact techniques with you but will give you some ideas.
Facebook ads is a more simple approach for you. Lots of guys start on this.
On instagram most of the sales are done in the dms, the hard part is finding the right leads and also having the sales skills to close them.
My advice is to find a very specific niche and work in that. This is because there is a lot of competition and these guys are going hard DMing hundreds to thousands of people a day.