a bulk diet (clean or dirty depending on what exactly you are looking for) and lifting heavy, muscle confusion...etc
as far as supplements go, you have many options
Staple Supplements
1.) Creatine - i prefer mono. BioCor offers creatine Mono for pretty cheap -
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2.) Protein - whey, blended...etc doesnt really matter because you should only have a shake once a day. Make your own weight gainer. 1 scoop of protein with ice cream, milk, EVOO, oats, peanut butter, fruits...etc
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3.) Fish Oil and Multi Vitamin - I prefer Orange Triad by Controlled Labs and I know most people on here would agree
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Supplements
1.) Pre Workout -Many options to choose from. Strong stim, to pump product/no stim...just depends on what you want. you can also add some agmatine in there for some nasty pumps. Invalid Link Removed
2.) Mass Supplements - my favorites include Anabeta by PES as well as IGF 2 by AppNut
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Other Supplements than can help you
Versa-1 by USP labs, Prime by USP Labs, DAA, Test Powder by USP Labs, Cit Mal - Invalid Link Removed
hope this helps a little.