Merge Downloaded Clips to MP4

I have between four and six video clips that I’ve downloaded from the internet and I need them stitched together into one smooth MP4 file. I’ll give you the exact sequence in which each clip should appear;... (Budget: $30 - $250 USD, Jobs: Adobe Premiere Pro, After Effects, DaVinci Resolve, Video Editing, Video Post-editing, Video Processing, Video Production, Video Services)