You should look at Job and postpone your idea for business towards later stage. Partnership is a big no for you, even in relations, especially if it involves financial commitments. You will eventually change your line and go in for business from job which is not for long term , but the moment at this time may not be the best moment for such a decision.
Regarding your question on Maraka Mars, the dasha of Markesh planet comes many times in ones life, but that does not mean it will harm the native till the period that is bad from the transit as well. Also the Bhadaka grah need to play a strong role to cause any major problems. Your Mars dasha will start in 2109 that very far as for now.