Hello and well done for breaking with 'marxist-leninism', which generally means a form of Stalinism - which most left communists would see as a political tendency produced by and furthering the capitalist counter-revolution.
There are different views among left communists regarding the form and role of the state in the period of transition but most would certainly see the necessity for power to be in the hands of workers' councils and similar mass organs (and not of a minority group or party). Again, the majority recognise the need for a revolutionary political organisation or party and acknowledge the contribution of Lenin but disagree with a number of his views, including support for national liberation struggles. The following ICC text tries to give a synthetic view of the left communist tradition: en.internationalism.org/the-communist-left