In the partnership agreement start with the following points, then add all the other points you all wish to agree upon.

It may sound negative, but once you can work out through these 3 points, then the rest is plain sailing. I have seen too many partnerships, myself included that have major problems when the partnership does well and then there is money in the kitty.

1. What each member is going to do for the partnership and the exact duties, and for this what is the expected remuneration, and when remuneration is paid - be very descriptive here. Make sure everyone is happy with the terms, especially if one partner is to be paid while the others support.
2. What occurs to the partnership if the duties as per 1 are not adhered too. What are the consequences/procedures/process/etc.
3. What is the procedure to dissolve the partnership, who gets what, and what are the terms.

All partners must have access to the bank account, a minimum of 2 partners required to do any payments, transfers. In the old days this was referred to as signatures on a cheque, however in today's electronic banking you require a business account, which has access and payment as individual members rights/access. This will reduce fraud or misuse of funds.

I suggest that you first start with a generic partnership agreement which can be downloaded from Google.
Read, add and remove clauses which match your requirements. Then adding the above points, go and see a lawyer, who will put all the clauses into an agreement. Make sure you understand each clause.

Once the first draft is drawn up, I would suggest getting a second opinion before accepting.