The basics of the process are all covered here: https://www.manager.io/guides/15718.
But, understand that your previous system’s equity structure seems questionable. It appears you are using a capital account structure, rather than a simple owner’s equity account. That’s fine. But you seem to have things mixed together that probably shouldn’t be. So it will probably be helpful to design your Manager equity structure first, then compute appropriate starting balances.
The balance of any capital account owner’s capital account should represent the amount that owner currently has invested in the business. That will be the net of all prior contributions plus distributed share of profit less drawings. For your example, this looks to be 1,000. So set the starting balance of your capital account to 1,000 Paid in advance. Subaccounts, like Drawings only come into play for capital account transactions, and do not appear in the chart of accounts. Therefore, they are not involved in setting starting balances.
The other equity account you will always have in Manager is Retained earnings, which is the net of all capital contributions, draws, receipts, and payments since inception. That will be where net profit resides until distributed to owners’ capital accounts. If you distributed all earnings to capital accounts under the prior system last year, Retained earnings will start at zero. But, if you left some earnings undistributed, enter that amount as the starting balance for Retained earnings.
If I understand the meaning of your equity structure, you should have two equity accounts with starting balances as follows: