Getting Started with Sequencing

So I have started my first display, nothing extravagant - some window outlines (6x) and gutter peaks (3x) and a megatree kit from boscoyo. Starting to push pixels and want to get things on the house soon, but I'm still struggling with figuring out where to get started with sequencing. Any advice, tips, tricks, etc? Should I be doing it all on my own from scratch, or are there good places to get started? I'm under the impression that there are sequences for free (or purchase) out there, but I'm not sure how to go about using them and making them work with my layout. For what it's worth, about 500 nodes for the tree, 1000 for the rest, running off a baldrick board. Thanks in advance for any insight to help me get through this hurdle.

View: https://www.youtube.com/watch?v=lM-bxrvbVrE

Agree w/ @Katekate - first thing is to look at OPS.
Google drive - freebies - find a link to it at xlights.org resources page
xlights.info - search for songs, ranging from free to OMG
xlightsseq.com - mostly free and lower-end prices

If you are looking for free sequences couple of main locations
https://drive.google.com/drive/folders/0B2ozCEidtWh3b1JWSlA0SldWTVk (password is generally xlights if you need one, some piz files rename to zip)
XLTAW - New sequence will be a few weeks but the old stuff is good https://xlightsaroundtheworld.com/

And the Australian version https://auschristmaslighting.com/th...hts-around-australia.16190/page-2#post-139622