to help wiht flow start of with simple lyrics, the more rhymes and multis you do the more complex the flow could be coz your rhyming alot, fo your just starte=ing out dont jump into multi heaven straight away get a basic flow and understanding of how it works then up your lyrical content.
what maybe said helps alot aswell, also when you record a verse do like 20 practice takes, then record 5 takes (record all takes though just for back up) then wait a day or 2 and lsiten to the 5 best takes giving your ears and mind a rest will help you hear stuff better when you go back, and you may notice you werent as good as you could be and record it again, repeat that till you are satisified with the take you have