Instead of asking how, you should change topic subject to "[ANN sportlibraries - "enter short site description"], give all information about site in first post, few pictures and after that do this:
1) do giveaway or contest in games and rounds
2) signature campaign
3) Promote on 3.1)Add networks
                    3.2) Social media
                    3.3) Other forums
edit*
Most important thing - hire web designer. Seriously.