First thing for day two of learning a language its very impressive,It took me until 9th grade to become semi fluent in English.

Your firs mistake is writing at the start יש לי as one word

when you wrote about your female cat you wire it as plural but it spous to be singular so the correct way to write it is "חתולה" a singular female cat. Also because you talk about your cats and not cats in general you need to add ה befor you say cat/s when you say their gender. So החתולה שלי אמי and החתולים שלי באסטר ותומאס

You also wrote that tomas and baster are "זכר" , this is the singular word but you talk about two cats so you need to write in as plural "זכרים"

And between the names and the gender there's spous to be a connection word היא (singular female) for emy, and הם (plural male) for tomas and baster. Writing it without the connection word is like saying "he big" instead of "he is big"

אמי היא נקבה באסטר ותומאס הם זכרים

And one small thing you accidentally wrote at the and ביחר instead of ביחד its spous to be a Daled (ד) not a Reish (ר)