First time homebuyer starting RE investing journey (House hacking multifamily)

[Tanner King]

I am a first time homebuyer looking to purchase a multifamily unit (duplex/3plex/4plex) in the San Antonio/ Boerne area. Ive been in contact with a real estate investor friendly realtor I was matched up with through the bigger pockets website. Next step is getting a pre approval letter. I have a list of lenders I have compiled through BP recommendations and recommendations from my realtor. 

I work a commission based job and am on pace to make just over 6 figures for the first time this year. My concern is my bank account doesn't show that currently (I do have the paystubs to back it up). I don't have the money in my account for a down payment currently but have a plan to within the next few months. I have a 401k and other assets that could equal a down payment just not my checking account. I only have credit card debt with a minimum monthly payment of under $300. 

Im wondering if it would be better for me to wait until I have the money in my bank account for a down payment, or at least another paycheck in the account (paid monthly) before I start shopping around for pre-approval letters. (Plan is an FHA loan)

If anyone can help me out with this it would be greatly appreciated! Also would appreciate any advice in general for someone starting out in real estate investing this way, or an insights on the SA/Boerne market.

Thanks ya'll look forward to hearing from you!