If you do some searching on the forums, you can probably find some decent example caps to get you started. Game design and coding is not easy but practice makes perfect. If you're making you first game by yourself or with few people, keep the scale small.
Here are some examples of 2D beat-em-up I've found and saved. They're really just a way to help you get started. Much work is ahead of you if you want to actually create a 2D beat 'em up.
https://www.dropbox.com/s/jenz1cadcvwzoa1/beatemup.capx?dl=0
https://www.dropbox.com/s/azbhlned0ya7iy9/Beatemup0.1%20May5%20Build.capx?dl=
https://www.dropbox.com/s/wlyguuzcble0o4x/beatemup%20with%20jumping.capx?dl=0
,thank you i look this , i want to be in single horizontal line like kugfu master 1984 with simple moves and punches maybe if easy to add some gun few enemies sprites wit repetitive spawns and noting complicated and some boss .