This is a very vague question- but I will take it literally as your post title suggests that you want to engage in a loaning business.

I do think that the best way to start with this kind of business is to establish yourself first in the forum. Along with the capital, you should also do some research about the forum users who would loan with your services. Avoid forum users who are newbies and instead, transact with high-ranking and well-reputable members for your security.

You should also have different kinds of cryptocurrencies at your disposal as different people want different cryptocurrencies. Lastly, remember that this is a risky business- expect to somehow lose some money at the first year of doing it.