Cancellation of business partnership

We (2 Parties) started a business with mutual understanding for the distribution of FMCG item as a C&F, we started business in March-21 with an initial investment, we didn't make any agreement and also the firm name also not registered, as 2nd party committed that in April he will complete the registration & other things. I was supposed to go abroad for three months & I went. The second party was knowing this, and he didn't make the deed & registration etc. When I followed him for these things from abroad on regular basis, after few weeks he started saying that he is not agree to say regarding these & blaming me that 'Why I am taking reports? Means this follow up & discuss over the progress, he denied by saying as above. Then after he said me that he will not continue with me, & separated the things on the %age of investment. He send me stock qty. as this yours and these are for him, & also the office furniture and other things. At that I told many times that whatever is your invest just calculate with its profitability and I will pay you, and also I was agreed that if you decided that the separation by stock then give me the value of your prorated qty. with its profitability, you will be paid. I said him that 'I will continue the business', he agreed but didn't give his stock. I told him that if you will hold this stock then what you will do because you can not sell these goods as I am doing the business not you, he said me that 'OK, I will keep this as personal use or I will throughout because this my property'. And some other things, he taken the office furniture, stationary & other things without my concern, & left in the office only that stock which he shown as my prorated qty as per his choice. Now, I just wanted to send him a 'Legal Notice' That; - He can not sell the goods in the market, & if he do....... there will be legal action with penalty. - What he did for separation in absence of me was not right & not accepted by me, so, that should be in good way by accountability of each sales & profit, and the other 1 will be paid by 2nd who is continuing the business. - He taken out with him some those things which was not the property of the firm, so, he will bear a penalty. The principle has authorised me to continue the business with another name. Please advise. Thanks & best Regards, Z. Alam