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theabortionatorhome depot or lowes.
Get yourself a cheap miter saw. Not necessary but will save time and make it easier to throw down some sweet angles for bracing etc.
Next step buy mad 2x4s. 2x4s, screws, and a saw can build a lot. Look for some free ply even if it's a bit beat up or grab some osb. Plywood is expensive.
Go big or go home. Honestly less than 5 feet is too small imo. 6 or bigger. Build your rails low with wide feet so it doesn't rock and the low height so you don't need as big of a takeoff.
Overbuild it because 2x4s are cheap. Mess around with the saw and cross brace the fuck out of it.
https://www.newschoolers.com/forum/1453/Build-A-Jib-101
This cult has some threads on success and fails building backyard parks. People using old carpet, construction fence, msnow, etc.
NarcopusPressure treated 2x4s ain’t that cheap and you definitely wouldn’t want a ramp made of non pressure treated wood