>>8186688Here's a step by step of the absolute bare bones basics you'll need to do.
Buy the Agent Fury. If your character isn't a black guy then find a ML in your collection or buy one with Caucasian hands (Starlord for trigger hands, Master of Kung Fu guy that's everywhere for the best selection of multiple hand sets) Buy flat black Testors Model Master acrylic at Hobby Lobby. Buy Vallejo skin tone, peach, whatever color matched those hands.
Take the jacket off fury, pop head and hands off. Wash entire figure with warm soapy water and let dry. Add a little bit of water to the Testors black because it's usually too thick right out of the jar. Use multiple thin coats to cover the white shirt. A hairdryer cures the paint faster between coats. Paint the neck, again multiple thin coats.
If you want to actually get into repainting figures then invest in a can of Duplicolor adhesion promoter or Bulldog adhesion Promoter sprays, found in the automotive paint dept of O'Reilleys and sometimes Walmart/AutoZone. That spray makes a molecular bridge between plastic and literally any other type of paint allowing you to use cheaper craft paints and Games Workshop paints on bare Marvel Legends once you put the primer down. The primer is clear to boot. Sealing your figure requires some thinned down Liquitex archival acrylic varnish found at Michael's Crafts/Hobby Lobby or Vallejo, but you don't get a lot in Vallejo, tho the individual bottle is cheaper than the larger bottle of Liquitex.
Customizing is fun but any good result requires effort, money, and patience. You won't want to look at your custom character that has fingerprints in thick paint that's wearing off the edges every time you pose it for very long and will grow to resent what you've done. A lot of customizers lose their way because their first attempt turns them off to the hobby, but only because they just jumped into it without planning. Done be that guy. Take your time, read some guides.