Having a listen with headphones
Once you have a standalone mic, you will need a good pair of headphones to help you monitor the audio as you record and edit your voice to its polished best.
Since your podcasts will mostly be listened by people on headphones, you should listen to your recordings on them as well. There's a marked difference from what you hear on speakers compared to what comes out on headphones. In-ear or over-ear headphones? Go for the latter, but the choice is yours. A decent budget model is the AKG511 which costs below RM200.
Try not to cut corners on good headphones. Without decent sound, you won't get an accurate feel of what your listeners are hearing.