How to record guitar with great quality?

What do I need to accomplish this?

Some things to consider before answering:

-Currently I have a tascam four track recorder which is decent but doesn t have that oompf that studio quality can get. Strangely, I get a fuller sound with my Samsung galaxy (before I dropped it). Was even considering publishing the songs straight from my phone.

-I have a Spanish nylon string guitar.

-I have one of those small cheap magnetic pickups that you tape onto an acoustic instrument to be able to plug it in via 1/4 inch (typically used by violinists, cellists or similar instruments) but it s flaky and I have to hold it really hard to the body of the guitar to get a nice rich, thick warm sound. Otherwise it s flat and tinny.

-I m using garage band.

-The ONLY Mics I have are an sm58, a 57, my phone, and the two stereo built in mics in the tascam. Up to this point I ve only used the tascam and my phone because I don t have the ideal set up to use the other mics. I m also curious to know if I can get decent quality like this or if it s absolutely necessary to purchase a Mic.)

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I tend to get a pretty nice sound while recording but when ever I bounc the song (from garage band or from tascam to GB) it weakens it. The volume is significantly lowered and lacks that punch that most recordings have. I m thinking this is a mastering issue. Maybe something to do with limiting and compression?

I know very little about recording. Would appreciate any help I can get.

Thanks!

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