Publish in ArXiv/Munich Personal RePEc Archive/SSRN
In the cae of ArXiv:

1) Yes. However, your paper needs to be endorsed by an established academic. See ArXiv's help on the endorsement system: https://arxiv.org/help/endorsement

2) You need to give ArXiv a perpetual license to distribute your work. But otherwise you retain the copyright. With a traditional subscription-based journal, you would typically have to give your copyright to the journal.