100k is the amt you need.
here is a guide for you.
1. Go to Tools -> Debug console and enter the command "masternode genkey".
2. Get account address from main wallet.
In Debug Console enter the command "getaccountaddress MyMasternode".
3. send exactly 100 000 AMS to the address generated in Step 2.
4. Get the proof of transaction in main wallet.
Enter "masternode outputs" and copy the output to the notepad. This is the proof of the transaction.
5. Update masternode.conf in main computer.
Open masternode.conf in the main computer (should be under AppData/AMS folder) and update it as below.
It should look something like this
MN1 IP:50020 PRIVATEKEY 918e5dfa....118093b 0
6. update AMS.conf file as below.
rpcuser=long random username
rpcpassword=longer random password
rpcallowip=127.0.0.1
listen=0
server=1
daemon=1
logtimestamps=1
maxconnections=256
masternode=1
externalip=your unique public ip address:50020
bind=your unique public ip address:50020
masternodeaddr=your unique public ip address:50020
masternodeprivkey= Masternode private key output from Step 1
7. Restart wallet
8. In Masternode tab make sure to activate your MN.