How do I best engage with this community to help with my upcoming launch?

Hi folks, I'm new to the community and launching a new mobile app product for bartering, favors, and paid goods and services. For those of you out there who have been in the Product Hunt community for a while or have launched a product, what top tips do you have to get engaged with this community and launch a successful product? Thanks in advance and I look forward to reading your responses! Cheers, Ian