Viper is one of the most execution-heavy characters in the game. If you don’t want to put the effort into learning a character like that, i’d start with the easy characters and work your way up.
Sentinel (him and hulk go great together, Hulk and drones go great together.)
Wesker (pretty much fits on any team that could use an OTG [off the ground] assist.)
Wolverine (very easy to play, and has damaging combos)
Doctor Doom (foot dive loops are very easy, and he has that derp j.S. Course, you’re going to have to learn more with him than just spamming his footdive.)
Akuma (pretty easy to play, high damage combos. Has one of the best assists in the game [tatsu], and is a great character to put in the anchor position [last on a team].)
I would suggest Vergil as a sorta-easy character, but sword loops may be sort of hard for someone transferring from AE to this game. Strider Hiryu also goes really well with Doom and Wesker due to his Vajira assist that they can combo off of.
EDIT: Added Akuma to the list. If I leave a character without an assist in the list below, then that means use whatever, or the character’s assists are average or awful. So a few good teams with these characters:
Hulk (anti-air gamma charge)/Sentinel (drones, not the bomb one)/Wesker (samurai edge)
Wolverine/Wesker (gunshot)/Akuma (tatsu)
Wolverine/Doom (missiles)/Sentinel (drones)
Wesker (samurai edge)/Doom (plasma beam)/Strider Hiryu (vajira)
Wolverine/Hulk (anti-air)/Sentinel (drones)
And if you wanted options for Vergil:
Vergil/Wesker (otg)/Strider (vajira)
Vergil/Doom (plasma Beam)/Strider (vajira)