I think internet marketing is a good idea, you don't need any capital to sell the products or services you only need to do is to introduce and promote the product or services you offer. It is a good source of Bitcoin, you don't need to invest you can only need is to get the trust of the buyer and consumer to have a good sales.
Yeah, your right but try to learn more using watching of videos regarding Internet Marketing nor reading of Blogs that topic with regards to Marketing using strategy.
It depends on what platform you are going to use upon marketing your products, if you will use social medias then you are free to do so but you need to have a lot of people to like on your page or you must have a wide scope of your friends. But if you can spend some bucks on it, that will be worth it because it can give you more audience.