Producers use common samples all of the time it's nothing rare, what matters is how you flip the specific sample.
Beat 1: I like it a lot, I would turn the levels on the Clap up a bit, add some wetness to it, maybe some EQ. This beat needs a solid hook, I was sitting listening waiting for the hook to kick in and it never did, I was disappointed. Add some Synth to this track, different hits on the beginning of every other bar, you want to build up towards the hook, etc. Add more to it. I could hear Jay Tee on this.
Beat 2: This isn't my style, I can hear the bass sounds, and it sounds like a beat boxer? Vocal bass, or whatever. Reminds me of Doo Wop. The main bass doesn't sound good, and it also goes out of tone/pitch, which should be fixed. You flipped the sample well, I don't like the snare, I like the kick drum.
Beat 3: Snare is way too low. You need to turn those snare drums up. Your snare drum should be louder than your hats, you don't want the levels of your hats interfering, so, bring that Snare/Clap up, and maybe layer it. You want those snares to stand out. Rest sounds ok.
Beat 4: Won't Play? For some reason. Might want to re upload that beat unless it's me, but I tried several times and it doesn't play.
Overall, for just starting out, you have a good style devloping. Beat 1 is by far the best sounding beat on the page, melody wise, percussion wise, and mix wise. For tips, there is not much I can tell you, you know if you are a composer/producer, you need to work at every part of your game. From making your drums/percs as tight as possible, to developing your melodies, your bass lines, to getting the proper sounding mix. Work at everything. That's what I do, I pay attention to every aspect, and if I bring one part of my process up a notch, it all has to come up a notch, feel me?
So, excel, practice, practice, practice. And don't get too attached to your beats, they are only beats. If you want to get out there, shoot your music to artists you want to work with, and see if they will get down on one of your beats, don't worry about the money right away, you need to build a name for yourself too and once you start working with more artists and developing your sound, you can develop your worth, and when you find out how much your worth, you can put that on your music. But, don't be afraid to give beats away, or sell them for very cheap $50-$100. Build your name.
